Extract pm-dicrionary validation

Issue-ID: VNFSDK-713
Signed-off-by: Pawel <pawel.kasperkiewicz@nokia.com>
Change-Id: Iee5a23a3a6c9215927aa2c453faab62d30453444

38 files changed, 3106 insertions, 0 deletions

diff --git a/pmdictionaryvalidation/pom.xml b/pmdictionaryvalidation/pom.xml
new file mode 100644
index 0000000..3822057
--- /dev/null
+++ b/pmdictionaryvalidation/pom.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>org.onap.vnfsdk.validation</groupId>
+        <artifactId>validation</artifactId>
+        <version>1.2.15-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>validation-pmdictionary</artifactId>
+    <packaging>jar</packaging>
+    <name>pmdictionaryvalidation/validation</name>
+
+    <repositories>
+        <repository>
+            <id>google-collections</id>
+            <name>Google collections repository</name>
+            <url>https://mvnrepository.com/artifact/com.google.collections/google-collections</url>
+        </repository>
+        <repository>
+            <id>onap</id>
+            <name>ONAP repository</name>
+            <url>https://nexus.onap.org/content/repositories/public/</url>
+        </repository>
+    </repositories>
+    <properties>
+        <log4j-slf4j-impl.version>2.13.3</log4j-slf4j-impl.version>
+        <snakeyaml.version>1.26</snakeyaml.version>
+        <junit.version>5.7.0</junit.version>
+        <assertj-core.version>3.18.1</assertj-core.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>${log4j-slf4j-impl.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-ext</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.yaml</groupId>
+            <artifactId>snakeyaml</artifactId>
+            <version>${snakeyaml.version}</version>
+        </dependency>
+        <!-- TEST dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlFileValidator.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlFileValidator.java
new file mode 100644
index 0000000..2de4f48
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlFileValidator.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.onap.validation.yaml.error.SchemaValidationError;
+import org.onap.validation.yaml.error.YamlDocumentValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.YamlSchema;
+import org.onap.validation.yaml.schema.YamlSchemaFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class YamlFileValidator {
+
+    private static final int FIRST_DOCUMENT_INDEX = 1;
+
+    public List<YamlDocumentValidationError> validateYamlFileWithSchema(String pathToFile)
+        throws YamlProcessingException {
+
+        List<YamlDocument> documents = new YamlLoader().loadMultiDocumentYamlFile(pathToFile);
+        if(!documents.isEmpty()) {
+            return validateDocuments(documents);
+        } else {
+            throw new YamlProcessingException("PM_Dictionary YAML file is empty");
+        }
+    }
+
+    private List<YamlDocumentValidationError> validateDocuments(List<YamlDocument> documents)
+        throws YamlProcessingException {
+
+        List<YamlDocumentValidationError> yamlFileValidationErrors = new ArrayList<>();
+        YamlSchema schema = extractSchema(documents);
+        YamlValidator validator = new YamlValidator(schema);
+
+        for (int index = FIRST_DOCUMENT_INDEX; index < documents.size(); index++) {
+            List<SchemaValidationError> validationErrors = validator.validate(documents.get(index));
+            yamlFileValidationErrors.addAll(transformErrors(index,validationErrors));
+        }
+
+        return yamlFileValidationErrors;
+    }
+
+    private List<YamlDocumentValidationError> transformErrors(int index, List<SchemaValidationError> validationErrors) {
+        return validationErrors
+            .stream()
+            .map(error->new YamlDocumentValidationError(index, error.getPath(), error.getMessage()))
+            .collect(Collectors.toList());
+    }
+
+    private YamlSchema extractSchema(List<YamlDocument> documents) throws YamlProcessingException {
+        return new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0));
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java
new file mode 100644
index 0000000..1a5eef9
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.yaml.snakeyaml.Yaml;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+class YamlLoader {
+
+    private static final Logger LOGGER =  LoggerFactory.getLogger(YamlLoader.class);
+
+    List<YamlDocument> loadMultiDocumentYamlFile(URL path)
+        throws YamlDocumentFactory.YamlDocumentParsingException {
+        List<YamlDocument> documentsFromFile = new ArrayList<>();
+        try (InputStream yamlStream = path.openStream()) {
+            for (Object yamlDocument : new Yaml().loadAll(yamlStream)) {
+                documentsFromFile.add(
+                    new YamlDocumentFactory().createYamlDocument(yamlDocument)
+                );
+            }
+        } catch (IOException e) {
+            LOGGER.error("Failed to load multi document YAML file",e);
+        }
+        return documentsFromFile;
+    }
+
+    List<YamlDocument> loadMultiDocumentYamlFile(String path)
+        throws YamlProcessingException {
+        try {
+            return loadMultiDocumentYamlFile(new URL("file://" + path));
+        } catch (MalformedURLException e) {
+            throw new YamlProcessingException("Fail to read file under given path.", e);
+        }
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlValidator.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlValidator.java
new file mode 100644
index 0000000..30ba646
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/YamlValidator.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.onap.validation.yaml.error.SchemaValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.process.YamlValidationProcess;
+import org.onap.validation.yaml.schema.YamlSchema;
+
+import java.util.List;
+
+public class YamlValidator {
+
+    private final YamlSchema schema;
+
+    YamlValidator(YamlSchema schema) {
+        this.schema = schema;
+    }
+
+    public List<SchemaValidationError> validate(YamlDocument document) throws YamlProcessingException {
+        return new YamlValidationProcess(schema,document).validate();
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/SchemaValidationError.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/SchemaValidationError.java
new file mode 100644
index 0000000..6ffe6d4
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/SchemaValidationError.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.error;
+
+public class SchemaValidationError {
+    private final String path;
+    private final String message;
+
+    public String getPath() {
+        return path;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public SchemaValidationError(String path, String message) {
+        this.path = path;
+        this.message = message;
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/YamlDocumentValidationError.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/YamlDocumentValidationError.java
new file mode 100644
index 0000000..f04708f
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/error/YamlDocumentValidationError.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.error;
+
+public class YamlDocumentValidationError {
+    private final int yamlDocumentNumber;
+    private final String path;
+    private final String message;
+
+    public YamlDocumentValidationError(int yamlDocumentNumber, String path, String message) {
+        this.yamlDocumentNumber = yamlDocumentNumber;
+        this.path = path;
+        this.message = message;
+    }
+
+    public int getYamlDocumentNumber() {
+        return yamlDocumentNumber;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/exception/YamlProcessingException.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/exception/YamlProcessingException.java
new file mode 100644
index 0000000..99c2437
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/exception/YamlProcessingException.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.exception;
+
+public class YamlProcessingException extends Exception {
+
+    public YamlProcessingException(String message, Throwable throwable) {
+        super(message, throwable);
+    }
+
+    public YamlProcessingException(String message) {
+        super(message);
+    }
+
+    public YamlProcessingException(Throwable throwable) {
+        super(throwable);
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java
new file mode 100644
index 0000000..557b6fd
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import java.util.Map;
+
+public class YamlDocument {
+
+    private final Map<String, Object> yaml;
+
+    YamlDocument(Map<String, Object> yaml) {
+        this.yaml = yaml;
+    }
+
+    public Map<String, Object> getYaml() {
+        return yaml;
+    }
+
+    public boolean containsKey(String key) {
+        return yaml.containsKey(key);
+    }
+
+    public String getValue(String key) {
+        return yaml.get(key).toString();
+    }
+
+    public YamlParametersList getListOfValues(String key) {
+        return new YamlParameterListFactory().createYamlParameterList(
+            yaml.get(key)
+        );
+    }
+
+    public YamlDocument getSubStructure(String name)
+        throws YamlDocumentFactory.YamlDocumentParsingException {
+        return new YamlDocumentFactory().createYamlDocument(
+            yaml.get(name)
+        );
+    }
+}
+
+
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java
new file mode 100644
index 0000000..b56422c
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class YamlDocumentFactory {
+
+    public YamlDocument createYamlDocument(Object yaml) throws YamlDocumentParsingException {
+        try {
+            Map<String, Object> parsedYaml = transformMap((Map) yaml);
+            return new YamlDocument(parsedYaml);
+        } catch (ClassCastException e) {
+            throw new YamlDocumentParsingException(
+                String.format("Fail to parse given objects: %s as yaml document.", yaml), e
+            );
+        }
+    }
+
+    private Map<String, Object> transformMap(Map<Object, Object> yaml) {
+        Map<String, Object> parsedYaml = new HashMap<>();
+        for (Map.Entry<Object, Object> entry: yaml.entrySet()) {
+            parsedYaml.put(entry.getKey().toString(), entry.getValue());
+        }
+        return parsedYaml;
+    }
+
+    public static class YamlDocumentParsingException extends YamlProcessingException {
+        YamlDocumentParsingException(String message, Throwable throwable) {
+            super(message, throwable);
+        }
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParameterListFactory.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParameterListFactory.java
new file mode 100644
index 0000000..5f41c5c
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParameterListFactory.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class YamlParameterListFactory {
+
+    public YamlParametersList createEmptyYamlParameterList() {
+        return new YamlParametersList(Collections.emptyList());
+    }
+
+    public YamlParametersList createYamlParameterList(Object yaml) {
+        List<String> parametersList = new ArrayList<>();
+        if( yaml instanceof List) {
+            for (Object element : (List) yaml) {
+                parametersList.add(element.toString());
+            }
+        } else {
+            parametersList.add(yaml.toString());
+        }
+        return new YamlParametersList(parametersList);
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParametersList.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParametersList.java
new file mode 100644
index 0000000..2b93c74
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/model/YamlParametersList.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import java.util.List;
+
+public class YamlParametersList {
+
+    private final List<String> parameters;
+
+    YamlParametersList(List<String> parameters) {
+        this.parameters = parameters;
+    }
+
+    public List<String> getParameters() {
+        return parameters;
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationProcess.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationProcess.java
new file mode 100644
index 0000000..ebd37ce
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationProcess.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.process;
+
+import org.onap.validation.yaml.error.SchemaValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.YamlSchema;
+import org.onap.validation.yaml.schema.node.YamlSchemaNode;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+
+public class YamlValidationProcess {
+
+    private final Queue<YamlValidationStep> validationSteps;
+    private final List<SchemaValidationError> errors;
+    private final YamlSchema schema;
+    private final YamlDocument document;
+
+    public YamlValidationProcess(YamlSchema schema, YamlDocument document) {
+        this.schema = schema;
+        this.document = document;
+        errors = new ArrayList<>();
+        validationSteps = new LinkedList<>();
+    }
+
+    public List<SchemaValidationError> validate() throws YamlProcessingException {
+        validationSteps.add(new YamlValidationStep(schema.getRootNodes(), document));
+        while (!validationSteps.isEmpty()) {
+            YamlValidationStep nextValidationNode = validationSteps.poll();
+            validateStep(nextValidationNode);
+        }
+        return errors;
+    }
+
+    private void validateStep(YamlValidationStep validationNode)
+        throws YamlProcessingException {
+        for (YamlSchemaNode schemaNode : validationNode.getSchemaNodes()) {
+            validateNode(validationNode.getDocument(), schemaNode);
+        }
+    }
+
+    private void validateNode(YamlDocument document, YamlSchemaNode schemaNode)
+        throws YamlProcessingException {
+
+        if (document.containsKey(schemaNode.getName())) {
+            if (schemaNode.isContainingSubStructure()) {
+                addNextLevelNodeToValidationNodesQueue(document, schemaNode);
+            } else if (!isValueOfNodeInAcceptedValuesList(document, schemaNode)) {
+                addIncorrectValueError(document, schemaNode);
+            }
+        } else if (schemaNode.isRequired()) {
+            addRequiredKeyNotFoundError(schemaNode);
+        }
+    }
+
+    private boolean isValueOfNodeInAcceptedValuesList(YamlDocument document, YamlSchemaNode node) {
+        return node.getAcceptedValues().isEmpty() ||
+            node.getAcceptedValues().containsAll(
+                document.getListOfValues(node.getName()).getParameters()
+            );
+    }
+
+    private void addNextLevelNodeToValidationNodesQueue(YamlDocument document, YamlSchemaNode node)
+        throws YamlProcessingException {
+        validationSteps.add(
+            new YamlValidationStep(
+                node.getNextNodes(),
+                document.getSubStructure(node.getName())
+            )
+        );
+    }
+
+    private void addRequiredKeyNotFoundError(YamlSchemaNode node) {
+        errors.add(
+            new SchemaValidationError(
+                node.getPath(),
+                String.format("Key not found: %s", node.getName())
+            )
+        );
+    }
+
+    private void addIncorrectValueError(YamlDocument document, YamlSchemaNode node) {
+        errors.add(
+            new SchemaValidationError(
+                node.getPath() + node.getName(),
+                String.format(
+                    "Value(s) is/are not in array of accepted values.%n value(s):  %s%n  accepted value(s):  %s",
+                    document.getValue(node.getName()), node.getAcceptedValues())
+            )
+        );
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationStep.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationStep.java
new file mode 100644
index 0000000..eb5ab8e
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/process/YamlValidationStep.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.process;
+
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.node.YamlSchemaNode;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+class YamlValidationStep {
+
+    private final List<YamlSchemaNode> schemaNodes;
+    private final YamlDocument document;
+
+    YamlValidationStep(List<YamlSchemaNode> nodes, YamlDocument yaml) {
+        this.schemaNodes = new ArrayList<>(nodes);
+        this.document = yaml;
+    }
+
+    List<YamlSchemaNode> getSchemaNodes() {
+        return Collections.unmodifiableList(schemaNodes);
+    }
+
+    YamlDocument getDocument() {
+        return document;
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchema.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchema.java
new file mode 100644
index 0000000..69bb6cd
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchema.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema;
+
+import org.onap.validation.yaml.schema.node.YamlSchemaNode;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class YamlSchema {
+
+    private final List<YamlSchemaNode> rootNodes;
+
+    public List<YamlSchemaNode> getRootNodes() {
+        return Collections.unmodifiableList(rootNodes);
+    }
+
+    YamlSchema(List<YamlSchemaNode> rootNodes) {
+        this.rootNodes = new ArrayList<>(rootNodes);
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchemaFactory.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchemaFactory.java
new file mode 100644
index 0000000..df7d673
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/YamlSchemaFactory.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+
+package org.onap.validation.yaml.schema;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+import org.onap.validation.yaml.schema.node.YamlSchemaNode;
+import org.onap.validation.yaml.schema.node.YamlSchemaNodeFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class YamlSchemaFactory {
+
+
+    private static final String ROOT_PATH = "/";
+
+    public YamlSchema createTreeStructuredYamlSchema(YamlDocument schema)
+        throws YamlProcessingException {
+
+        return new YamlSchema(getRootNodes(schema));
+    }
+
+    private List<YamlSchemaNode> getRootNodes(YamlDocument yamlDocument)
+        throws YamlProcessingException {
+
+        List<YamlSchemaNode> nextNodes = new ArrayList<>();
+        for(String nodeName: yamlDocument.getYaml().keySet()) {
+            nextNodes.add(
+                new YamlSchemaNodeFactory().createNode(
+                    nodeName,
+                    ROOT_PATH,
+                    new YamlDocumentFactory().createYamlDocument(
+                        yamlDocument.getYaml().get(nodeName)
+                    )
+                )
+            );
+        }
+        return nextNodes;
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaBranchNode.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaBranchNode.java
new file mode 100644
index 0000000..0f5b480
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaBranchNode.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema.node;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+public class YamlSchemaBranchNode extends YamlSchemaNode {
+
+    private final YamlDocument nextNodesInLazyForm;
+    private Optional<List<YamlSchemaNode>> nextNodes;
+
+    YamlSchemaBranchNode(String name, String path, boolean required, String comment,
+                         YamlDocument nextNodesInLazyForm) {
+        super(name, path, required, comment);
+        this.nextNodesInLazyForm = nextNodesInLazyForm;
+        this.nextNodes = Optional.empty();
+    }
+
+    @Override
+    public boolean isContainingSubStructure() {
+        return true;
+    }
+
+    @Override
+    public List<String> getAcceptedValues() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public synchronized List<YamlSchemaNode> getNextNodes() throws YamlSchemaProcessingException {
+        try {
+            return nextNodes.orElseGet(this::loadNextNodes);
+        } catch (YamlSchemaLazyLoadingException lazyLoadingException) {
+            throw new YamlSchemaProcessingException(lazyLoadingException);
+        }
+    }
+
+    private List<YamlSchemaNode> loadNextNodes() {
+        try {
+            List<YamlSchemaNode> loadedNextNodes = new ArrayList<>();
+            for (String key : nextNodesInLazyForm.getYaml().keySet()) {
+                YamlDocument substructure = new YamlDocumentFactory()
+                    .createYamlDocument(nextNodesInLazyForm.getYaml().get(key));
+                loadedNextNodes.add(new YamlSchemaNodeFactory().createNode(key, getPath() + getName() + "/", substructure));
+            }
+            nextNodes = Optional.of(loadedNextNodes);
+            return loadedNextNodes;
+        } catch (YamlProcessingException e) {
+            throw new YamlSchemaLazyLoadingException("Lazy loading failed, due to yaml parsing exception.",e);
+        }
+    }
+
+    static class YamlSchemaLazyLoadingException extends RuntimeException {
+        YamlSchemaLazyLoadingException(String message, Throwable throwable) {
+            super(message, throwable);
+        }
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaLeafNode.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaLeafNode.java
new file mode 100644
index 0000000..c98f41e
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaLeafNode.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema.node;
+
+import org.onap.validation.yaml.model.YamlParametersList;
+
+import java.util.Collections;
+import java.util.List;
+
+public class YamlSchemaLeafNode extends YamlSchemaNode {
+
+    private final YamlParametersList acceptedValues;
+
+    YamlSchemaLeafNode(String name, String path, boolean required, String comment,
+                       YamlParametersList acceptedValues) {
+        super(name, path, required, comment);
+        this.acceptedValues = acceptedValues;
+    }
+
+    @Override
+    public List<String> getAcceptedValues() {
+        return acceptedValues.getParameters();
+    }
+
+    @Override
+    public List<YamlSchemaNode> getNextNodes() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean isContainingSubStructure() {
+        return false;
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNode.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNode.java
new file mode 100644
index 0000000..28913a2
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNode.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema.node;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+
+import java.util.List;
+
+public abstract class YamlSchemaNode {
+
+    private final String path;
+    private final String name;
+    private final boolean required;
+    private final String comment;
+
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public boolean isRequired() {
+        return required;
+    }
+
+    public abstract List<String> getAcceptedValues();
+
+    public abstract List<YamlSchemaNode> getNextNodes() throws YamlSchemaProcessingException;
+
+    public abstract boolean isContainingSubStructure();
+
+    public String getComment() {
+        return comment;
+    }
+
+    YamlSchemaNode(String name, String path, boolean required, String comment) {
+        this.name = name;
+        this.path = path;
+        this.required = required;
+        this.comment = comment;
+    }
+
+    static class YamlSchemaProcessingException extends YamlProcessingException {
+        YamlSchemaProcessingException(Throwable throwable) {
+            super(throwable);
+        }
+    }
+}
diff --git a/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactory.java b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactory.java
new file mode 100644
index 0000000..79a8f14
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactory.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema.node;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+import org.onap.validation.yaml.model.YamlParameterListFactory;
+import org.onap.validation.yaml.model.YamlParametersList;
+
+import static org.onap.validation.yaml.model.YamlDocumentFactory.YamlDocumentParsingException;
+
+public class YamlSchemaNodeFactory {
+
+    public static final String EMPTY_COMMENT = "no comment available";
+    static final String STRUCTURE_KEY = "structure";
+    static final String COMMENT_KEY = "comment";
+    static final String VALUE_KET = "value";
+    static final String PRESENCE_KEY = "presence";
+    static final String PRESENCE_REQUIRED_KEY = "required";
+
+    public YamlSchemaNode createNode(String nodeName, String path, YamlDocument yamlDocument)
+        throws YamlProcessingException {
+
+        YamlSchemaNode yamlSchemaNode;
+        if(isYamlContainingKey(yamlDocument, STRUCTURE_KEY)) {
+            yamlSchemaNode = new YamlSchemaBranchNode(
+                nodeName, path, getIsPresenceRequired(yamlDocument), getComment(yamlDocument),
+                getNextNodes(yamlDocument)
+            );
+        } else {
+            yamlSchemaNode = new YamlSchemaLeafNode(
+                nodeName, path, getIsPresenceRequired(yamlDocument), getComment(yamlDocument),
+                getAcceptedValues(yamlDocument)
+            );
+        }
+        return  yamlSchemaNode;
+    }
+
+    private YamlDocument getNextNodes(YamlDocument yamlDocument)
+        throws YamlDocumentParsingException {
+        return new YamlDocumentFactory().createYamlDocument(yamlDocument.getYaml().get(STRUCTURE_KEY));
+    }
+
+    private String getComment(YamlDocument yamlDocument) {
+
+        return isYamlContainingKey(yamlDocument, COMMENT_KEY)
+            ? yamlDocument.getYaml().get(COMMENT_KEY).toString()
+            : EMPTY_COMMENT;
+    }
+
+    private YamlParametersList getAcceptedValues(YamlDocument yamlDocument) {
+
+        return isYamlContainingKey(yamlDocument, VALUE_KET)
+            ? new YamlParameterListFactory().createYamlParameterList(yamlDocument.getYaml().get(VALUE_KET))
+            : new YamlParameterListFactory().createEmptyYamlParameterList();
+    }
+
+    private boolean getIsPresenceRequired(YamlDocument yamlDocument) {
+
+        return isYamlContainingKey(yamlDocument, PRESENCE_KEY)
+            && yamlDocument.getYaml().get(PRESENCE_KEY).equals(PRESENCE_REQUIRED_KEY);
+    }
+
+    private boolean isYamlContainingKey(YamlDocument yamlDocument, String structureKey) {
+        return yamlDocument.getYaml().containsKey(structureKey);
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/main/resources/log4j2.properties b/pmdictionaryvalidation/src/main/resources/log4j2.properties
new file mode 100644
index 0000000..f3202ee
--- /dev/null
+++ b/pmdictionaryvalidation/src/main/resources/log4j2.properties
@@ -0,0 +1,48 @@
+# Copyright Nokia 2020,2020 Huawei Technologies Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# By default, log4j2 will look for a configuration file named log4j2.xml on the classpath.
+# reference: https://logging.apache.org/log4j/2.x/faq.html#troubleshooting
+
+rootLogger.level=ERROR
+rootLogger.appenderRefs=file
+rootLogger.appenderRef.file.ref=RollingFile
+
+logger.onap.name = org.onap
+logger.onap.level=ERROR
+logger.onap.additivity=false
+logger.onap.appenderRef.stdout.ref=STDOUT
+
+appenders=stdout, file
+
+# Direct log messages to stdout
+appender.stdout.type=Console
+appender.stdout.name=STDOUT
+appender.stdout.target=SYSTEM_OUT
+appender.stdout.layout.type=PatternLayout
+appender.stdout.layout.pattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
+
+# Redirect log messages to a log file, support file rolling.
+appender.file.type = RollingFile
+appender.file.name = RollingFile
+appender.file.fileName=./pmdictionary-validate.log
+appender.file.filePattern=./pmdictionary-validate.%d{yyyy-MM-dd-HH:mm:ss}.log
+appender.file.append=true
+appender.file.policies.type=Policies
+appender.file.policies.size.type=SizeBasedTriggeringPolicy
+appender.file.policies.size.size=5MB
+appender.file.strategy.type=DefaultRolloverStrategy
+appender.file.strategy.max=10
+appender.file.layout.type=PatternLayout
+appender.file.layout.pattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlFileValidatorTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlFileValidatorTest.java
new file mode 100644
index 0000000..089348d
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlFileValidatorTest.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.assertj.core.util.Lists;
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.error.YamlDocumentValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.yaml.snakeyaml.parser.ParserException;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class YamlFileValidatorTest {
+
+    @Test
+    void shouldReturnCorrectErrorsWhenGivenPathToValidPmDictionaryFile() throws YamlProcessingException {
+        // given
+        String path = getFullPathForGivenResources(YamlLoadingUtils.PATH_TO_VALID_YAML);
+
+        // when
+        List<YamlDocumentValidationError> validationErrors = new YamlFileValidator().validateYamlFileWithSchema(path);
+
+        // then
+        assertValidationReturnedExpectedErrors(validationErrors);
+
+    }
+
+    @Test
+    void shouldReturnCorrecErrorsWhenGivenPathToValidJsonStylePmDictionaryFile() throws YamlProcessingException {
+        // given
+        String path = getFullPathForGivenResources(YamlLoadingUtils.PATH_TO_VALID_JSON_STYLE_YAML);
+
+        // when
+        List<YamlDocumentValidationError> validationErrors = new YamlFileValidator().validateYamlFileWithSchema(path);
+
+        // then
+        assertValidationReturnedExpectedErrors(validationErrors);
+    }
+
+
+    private void assertValidationReturnedExpectedErrors(List<YamlDocumentValidationError> validationErrors) {
+        assertThat(validationErrors)
+                .isNotNull()
+                .hasSize(4)
+                .usingRecursiveFieldByFieldElementComparator()
+                .containsAll(
+                        Lists.list(
+                                new YamlDocumentValidationError(1,
+                                        "/pmMetaData/pmFields/measResultType",
+                                        "Value(s) is/are not in array of accepted values.\n" +
+                                                " value(s):  integer\n" +
+                                                "  accepted value(s):  [float, uint32, uint64]"),
+                                new YamlDocumentValidationError(1,
+                                        "/pmMetaData/pmFields/",
+                                        "Key not found: measChangeType"),
+                                new YamlDocumentValidationError(2,
+                                        "/pmMetaData/pmFields/",
+                                        "Key not found: measChangeType"),
+                                new YamlDocumentValidationError(3,
+                                        "/pmMetaData/pmFields/measAdditionalFields/vendorField1",
+                                        "Value(s) is/are not in array of accepted values.\n" +
+                                                " value(s):  [Z, A]\n" +
+                                                "  accepted value(s):  [X, Y, Z]")
+                        )
+                );
+    }
+
+    @Test
+    void shouldThrowErrorWhenGivenPathToInvalidPmDictionaryFile() {
+        // given
+        String path = getFullPathForGivenResources(YamlLoadingUtils.PATH_TO_MULTI_DOCUMENT_INVALID_YAML);
+        // when  then
+        assertThatThrownBy(() -> new YamlFileValidator().validateYamlFileWithSchema(path))
+                .isInstanceOf(ParserException.class)
+                .hasMessageContaining("expected the node content, but found '<document end>'");
+    }
+
+    @Test
+    void shouldThrowErrorWhenGivenInvalidPath() {
+        // given
+        String path = "invalid/path/to/pm_dictionary";
+
+        // when  then
+        assertThatThrownBy(() -> new YamlFileValidator().validateYamlFileWithSchema(path))
+                .isInstanceOf(YamlProcessingException.class)
+                .hasMessageContaining("PM_Dictionary YAML file is empty");
+    }
+
+    private String getFullPathForGivenResources(String pathToValidYaml) {
+        return this.getClass().getClassLoader().getResource(pathToValidYaml).getPath();
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoaderTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoaderTest.java
new file mode 100644
index 0000000..36297ca
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoaderTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+import org.yaml.snakeyaml.parser.ParserException;
+import org.yaml.snakeyaml.scanner.ScannerException;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+
+class YamlLoaderTest {
+
+    private static final int EXPECTED_NUMBER_OF_DOCUMENTS = 5;
+    private static final String LETTER_S_WITH_ASCII_CODE = "s(115)";
+
+    @Test
+    void shouldLoadAllDocumentsFromYamlFile() throws YamlDocumentFactory.YamlDocumentParsingException {
+        // when
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+
+        // then
+        assertThat(documents).hasSize(EXPECTED_NUMBER_OF_DOCUMENTS);
+    }
+
+    @Test
+    void shouldLoadAllDocumentsFromJsonStyleYamlFile() throws YamlDocumentFactory.YamlDocumentParsingException {
+        // when
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidJsonStyleMultiDocumentYamlFile();
+
+        // then
+        assertThat(documents).hasSize(EXPECTED_NUMBER_OF_DOCUMENTS);
+    }
+
+    @Test
+    void shouldLoadAllDocumentsFromYamlFileUsingPathInString() throws YamlProcessingException {
+        // when
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFileUsingStringPath();
+
+        // then
+        assertThat(documents).hasSize(EXPECTED_NUMBER_OF_DOCUMENTS);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenLoadingDocumentsFromInvalidYamlFile() {
+        // when then
+        assertThatThrownBy(YamlLoadingUtils::tryToLoadMultiDocumentInvalidYamlFile)
+                .isInstanceOf(ParserException.class)
+                .hasMessageContaining("expected the node content, but found '<document end>'");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenLoadingDocumentsFromInvalidYamlFileUsingPathInString() {
+        // when then
+        assertThatThrownBy(YamlLoadingUtils::tryToLoadMultiDocumentInvalidYamlFileUsingStringPath)
+                .isInstanceOf(ParserException.class)
+                .hasMessageContaining("expected the node content, but found '<document end>'");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenLoadingInvalidYamlFileWithIncorrectKeyMapping() {
+        // when then
+        assertThatThrownBy(YamlLoadingUtils::tryToLoadInvalidYamlFileWithIncorrectKeyMapping)
+                .isInstanceOf(ScannerException.class)
+                .hasMessageContaining("mapping values are not allowed here");
+    }
+
+    @Test
+    void shouldThrowExceptionWhenLoadingInvalidYamlFileWithUnknownEscapeCharacter() {
+        // when then
+        assertThatThrownBy(YamlLoadingUtils::tryToLoadInvalidYamlFileWithUnknownEscapeCharacter)
+                .isInstanceOf(ScannerException.class)
+                .hasMessageContaining("found unknown escape character " + LETTER_S_WITH_ASCII_CODE);
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoadingUtils.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoadingUtils.java
new file mode 100644
index 0000000..b65029f
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlLoadingUtils.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+
+import java.net.URL;
+import java.util.List;
+
+import static org.onap.validation.yaml.model.YamlDocumentFactory.YamlDocumentParsingException;
+
+public final class YamlLoadingUtils {
+
+    private YamlLoadingUtils() { }
+
+    public static final int VALID_YAML_DOCUMENT_INDEX = 4;
+    public static final int YAML_DOCUMENT_WITH_WRONG_VALUE_IN_ARRAY_INDEX = 3;
+    public static final int YAML_DOCUMENT_WITH_MISSING_FIELD_INDEX = 2;
+    public static final int YAML_DOCUMENT_WITH_MISSING_FIELD_AND_WRONG_VALUE_INDEX = 1;
+
+    static final String PATH_TO_VALID_YAML = "yaml_schema/PM_Dictionary.yaml";
+    static final String PATH_TO_VALID_JSON_STYLE_YAML = "yaml_schema/PM_Dictionary_JSON_Style.yaml";
+    private static final String PATH_TO_SIMPLE_VALID_SCHEMA = "yaml_schema/Simple_Valid_Schema.yaml";
+    private static final String PATH_TO_SIMPLE_VALID_SCHEMA_MULTI_ROOT = "yaml_schema/Simple_Valid_Schema_Multi_Root.yaml";
+    private static final String PATH_TO_SIMPLE_INVALID_SCHEMA = "yaml_schema/Simple_Invalid_Schema_Construction.yaml";
+    private static final String PATH_TO_SIMPLE_INVALID_SCHEMA_FOR_LAZY_LOADING = "yaml_schema/Simple_Invalid_Schema_LazyLoading.yaml";
+    static final String PATH_TO_MULTI_DOCUMENT_INVALID_YAML = "yaml_schema/Multi_Document_Invalid.yaml";
+    private static final String PATH_TO_INVALID_YAML_WITH_INCORRECT_KEY_MAPPING = "yaml_schema/Simple_Invalid_Mapping_Value.yaml";
+    private static final String PATH_TO_INVALID_YAML_WITH_UNKNOWN_ESCAPE_CHARACTER = "yaml_schema/Simple_Unknown_Escape_Character.yaml";
+
+    public static List<YamlDocument> loadValidMultiDocumentYamlFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_VALID_YAML));
+    }
+
+    public static List<YamlDocument> loadValidJsonStyleMultiDocumentYamlFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_VALID_JSON_STYLE_YAML));
+    }
+
+    public static List<YamlDocument> loadValidMultiDocumentYamlFileUsingStringPath() throws YamlProcessingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_VALID_YAML).getPath());
+    }
+
+    public static YamlDocument loadSimpleValidYamlSchemaFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_SIMPLE_VALID_SCHEMA)).get(0);
+    }
+
+    public static YamlDocument loadSimpleInvalidYamlSchemaFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_SIMPLE_INVALID_SCHEMA)).get(0);
+    }
+
+    public static YamlDocument loadSimpleInvalidYamlSchemaForLazyLoadingFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_SIMPLE_INVALID_SCHEMA_FOR_LAZY_LOADING)).get(0);
+    }
+
+    public static YamlDocument loadSimpleValidYamlSchemaWithMultiRootFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_SIMPLE_VALID_SCHEMA_MULTI_ROOT)).get(0);
+    }
+
+    public static List<YamlDocument> tryToLoadMultiDocumentInvalidYamlFile() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_MULTI_DOCUMENT_INVALID_YAML));
+    }
+
+    public static List<YamlDocument> tryToLoadMultiDocumentInvalidYamlFileUsingStringPath() throws YamlProcessingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_MULTI_DOCUMENT_INVALID_YAML).getPath());
+    }
+
+    public static List<YamlDocument> tryToLoadInvalidYamlFileWithIncorrectKeyMapping() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_INVALID_YAML_WITH_INCORRECT_KEY_MAPPING));
+    }
+
+    public static List<YamlDocument> tryToLoadInvalidYamlFileWithUnknownEscapeCharacter() throws YamlDocumentParsingException {
+        return new YamlLoader().loadMultiDocumentYamlFile(getUrlForGivenPath(PATH_TO_INVALID_YAML_WITH_UNKNOWN_ESCAPE_CHARACTER));
+    }
+
+    private static URL getUrlForGivenPath(String path) {
+        return YamlLoadingUtils.class.getClassLoader().getResource(path);
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlValidatorTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlValidatorTest.java
new file mode 100644
index 0000000..3f64540
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/YamlValidatorTest.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml;
+
+import org.assertj.core.util.Lists;
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.error.SchemaValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.YamlSchemaFactory;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.onap.validation.yaml.YamlLoadingUtils.VALID_YAML_DOCUMENT_INDEX;
+import static org.onap.validation.yaml.YamlLoadingUtils.YAML_DOCUMENT_WITH_MISSING_FIELD_AND_WRONG_VALUE_INDEX;
+import static org.onap.validation.yaml.YamlLoadingUtils.YAML_DOCUMENT_WITH_MISSING_FIELD_INDEX;
+import static org.onap.validation.yaml.YamlLoadingUtils.YAML_DOCUMENT_WITH_WRONG_VALUE_IN_ARRAY_INDEX;
+
+class YamlValidatorTest {
+
+    @Test
+    void shouldCreateValidatorUsingSchemaLoadedFromYamlFileAndValidatedJsonStyleDocumentsFromThatFile()
+            throws YamlProcessingException {
+
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidJsonStyleMultiDocumentYamlFile();
+        YamlValidator validator = new YamlValidator(new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0)));
+        Map<Integer, List<SchemaValidationError>> validationErrors = new HashMap<>();
+
+        // when
+        for (int documentIndex = 1; documentIndex < documents.size(); documentIndex++) {
+            validationErrors.put(documentIndex, validator.validate(documents.get(documentIndex)));
+        }
+
+        // then
+        assertValidatorReturnedCorrectErrors(validationErrors);
+    }
+
+    @Test
+    void shouldCreateValidatorUsingSchemaLoadedFromYamlFileAndValidatedDocumentsFromThatFile()
+            throws YamlProcessingException {
+
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+        YamlValidator validator = new YamlValidator(new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0)));
+        Map<Integer, List<SchemaValidationError>> validationErrors = new HashMap<>();
+
+        // when
+        for (int documentIndex = 1; documentIndex < documents.size(); documentIndex++) {
+            validationErrors.put(documentIndex, validator.validate(documents.get(documentIndex)));
+        }
+
+        // then
+        assertValidatorReturnedCorrectErrors(validationErrors);
+    }
+
+    private void assertValidatorReturnedCorrectErrors(Map<Integer, List<SchemaValidationError>> validationErrors) {
+
+        SchemaValidationError expectedValidationValueError =
+                new SchemaValidationError(
+                        "/pmMetaData/pmFields/measResultType",
+                        "Value(s) is/are not in array of accepted values.\n"
+                                + " value(s):  integer\n"
+                                + "  accepted value(s):  [float, uint32, uint64]"
+                );
+        SchemaValidationError expectedValidationKeyError =
+                new SchemaValidationError(
+                        "/pmMetaData/pmFields/",
+                        "Key not found: measChangeType"
+                );
+        SchemaValidationError expectedValidationValuesInArrayError =
+                new SchemaValidationError(
+                        "/pmMetaData/pmFields/measAdditionalFields/vendorField1",
+                        "Value(s) is/are not in array of accepted values.\n"
+                                + " value(s):  [Z, A]\n"
+                                + "  accepted value(s):  [X, Y, Z]"
+                );
+
+        assertThat(validationErrors)
+                .hasSize(4)
+                .containsKeys(1, 2, 3);
+        assertThat(validationErrors.get(YAML_DOCUMENT_WITH_MISSING_FIELD_AND_WRONG_VALUE_INDEX))
+                .hasSize(2)
+                .usingFieldByFieldElementComparator()
+                .containsAll(Lists.list(
+                        expectedValidationValueError,
+                        expectedValidationKeyError
+                ));
+        assertThat(validationErrors.get(YAML_DOCUMENT_WITH_MISSING_FIELD_INDEX))
+                .hasSize(1)
+                .usingFieldByFieldElementComparator()
+                .contains(expectedValidationKeyError);
+        assertThat(validationErrors.get(YAML_DOCUMENT_WITH_WRONG_VALUE_IN_ARRAY_INDEX))
+                .hasSize(1)
+                .usingFieldByFieldElementComparator()
+                .contains(expectedValidationValuesInArrayError);
+        assertThat(validationErrors.get(VALID_YAML_DOCUMENT_INDEX)).hasSize(0);
+    }
+
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlDocumentFactoryTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlDocumentFactoryTest.java
new file mode 100644
index 0000000..0bd0579
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlDocumentFactoryTest.java
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.onap.validation.yaml.model.YamlDocumentFactory.YamlDocumentParsingException;
+
+class YamlDocumentFactoryTest {
+
+    @Test
+    void shouldTurnMapOfUnknownKeyTypeToMapWithStringKeysAndBeAbleToReturnStringifyValues()
+            throws YamlDocumentParsingException {
+        // given
+        List<String> testList = List.of("element1", "element11");
+        Map<Object, Object> testEmptyMap = Collections.emptyMap();
+        Map<Object, Object> inputMap = Map.of(
+                "test", testList,
+                345, "element2",
+                "test2", "element3",
+                2.67, testEmptyMap);
+
+        // when
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(inputMap);
+
+        // then
+        assertThat(document).isNotNull();
+        assertThat(document.getYaml()).containsKeys("test", "345", "test2", "2.67");
+
+        assertThat(document.getYaml()).containsEntry("test", testList);
+        assertThat(document.getValue("test")).isEqualTo("[element1, element11]");
+
+        assertThat(document.getValue("345")).isEqualTo("element2");
+        assertThat(document.getValue("test2")).isEqualTo("element3");
+
+        assertThat(document.getYaml()).containsEntry("2.67", testEmptyMap);
+        assertThat(document.getValue("2.67")).isEqualTo("{}");
+    }
+
+    @Test
+    void shouldTurnMapOfUnknownKeyTypeToMapWithStringKeysAndBeAbleToExtractSubStructure()
+            throws YamlDocumentParsingException {
+        // given
+        Map<Object, Object> subStructureMap = Map.of(
+                "subTest1", "subElement1",
+                "subTest2", "subElement2");
+        Map<Object, Object> inputMap = Map.of(
+                "test", "element1",
+                "structure", subStructureMap);
+
+        // when
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(inputMap);
+
+        // then
+        assertThat(document).isNotNull();
+        assertThat(document.getYaml()).containsKeys("test", "structure");
+        assertThat(document.getValue("test")).isEqualTo("element1");
+
+        assertThat(document.getSubStructure("structure")).isNotNull();
+        assertThat(document.getSubStructure("structure").getValue("subTest1")).isEqualTo("subElement1");
+        assertThat(document.getSubStructure("structure").getValue("subTest2")).isEqualTo("subElement2");
+    }
+
+    @Test
+    void shouldTurnMapOfUnknownKeyTypeToMapWithStringKeysAndBeAbleToExtractParametersList()
+            throws YamlDocumentParsingException {
+        // given
+        List<String> parametersList = List.of("parameter1", "parameter2");
+        Map<Object, Object> inputMap = Map.of(
+                "test", "element1",
+                "parameters", parametersList);
+
+        // when
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(inputMap);
+
+        // then
+        assertThat(document).isNotNull();
+        assertThat(document.getYaml()).containsKeys("test", "parameters");
+        assertThat(document.getValue("test")).isEqualTo("element1");
+
+        assertThat(document.getListOfValues("parameters")).isNotNull();
+        assertThat(document.getListOfValues("parameters").getParameters()).contains("parameter1", "parameter2");
+    }
+
+    @Test
+    void shouldThrowExceptionIfGetSubStructureIsCalledOnList()
+            throws YamlDocumentParsingException {
+        // given
+        List<String> testList = List.of("element1", "element2");
+        Map<Object, Object> inputMap = Collections.singletonMap("test", testList);
+
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(inputMap);
+
+        // when then
+        assertThatThrownBy(() -> document.getSubStructure("test"))
+                .isInstanceOf(YamlDocumentParsingException.class)
+                .hasMessageContaining(String.format("Fail to parse given objects: %s as yaml document", testList));
+    }
+
+    @Test
+    void shouldThrowExceptionIfGetSubStructureIsCalledOnString()
+            throws YamlDocumentParsingException {
+        // given
+        Map<Object, Object> inputMap = Collections.singletonMap("test", "testElement");
+
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(inputMap);
+
+        // when then
+        assertThatThrownBy(() -> document.getSubStructure("test"))
+                .isInstanceOf(YamlDocumentParsingException.class)
+                .hasMessageContaining(String.format("Fail to parse given objects: %s as yaml document.", "testElement"));
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlParameterListFactoryTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlParameterListFactoryTest.java
new file mode 100644
index 0000000..ed15532
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/model/YamlParameterListFactoryTest.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.model;
+
+import org.assertj.core.util.Lists;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class YamlParameterListFactoryTest {
+
+    @Test
+    void shouldCreateEmptyParametersList() {
+        // when
+        YamlParametersList parametersList = new YamlParameterListFactory().createEmptyYamlParameterList();
+
+        // then
+        assertThat(parametersList).isNotNull();
+        assertThat(parametersList.getParameters()).isEmpty();
+    }
+
+    @Test
+    void shouldCreateParametersListContainingStringsFromListContainingSimpleTypes() {
+        // given
+        List<Object>  elements = List.of("test1", 3, 23.45, 'a', "test2");
+
+        // when
+        YamlParametersList parametersList = new YamlParameterListFactory().createYamlParameterList( elements);
+
+        // then
+        assertThat(parametersList).isNotNull();
+        assertThat(parametersList.getParameters())
+                .hasSize(5)
+                .contains("test1", "test2", "3", "23.45", "a");
+    }
+
+    @Test
+    void shouldCreateParametersListContainingStringsFromListContainingVariousTypes() {
+        // given
+        List<Object> testList = List.of("test1", 3, Lists.list(2, 3, 4), "test2");
+
+        // when
+        YamlParametersList parametersList = new YamlParameterListFactory().createYamlParameterList(testList);
+
+        // then
+        assertThat(parametersList).isNotNull();
+        assertThat(parametersList.getParameters())
+                .hasSize(4)
+                .contains("test1", "test2", "3", "[2, 3, 4]");
+    }
+
+    @Test
+    void shouldCreateListWithOneStringWhenGivenObjectIsNotList() {
+        // given
+        Object testObject = "test";
+
+        // when
+        YamlParametersList parametersList = new YamlParameterListFactory().createYamlParameterList(testObject);
+
+        // then
+        assertThat(parametersList).isNotNull();
+        assertThat(parametersList.getParameters())
+                .hasSize(1)
+                .contains("test");
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/process/YamlValidationProcessTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/process/YamlValidationProcessTest.java
new file mode 100644
index 0000000..4c602e0
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/process/YamlValidationProcessTest.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.process;
+
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.YamlLoadingUtils;
+import org.onap.validation.yaml.error.SchemaValidationError;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.YamlSchema;
+import org.onap.validation.yaml.schema.YamlSchemaFactory;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.onap.validation.yaml.YamlLoadingUtils.VALID_YAML_DOCUMENT_INDEX;
+import static org.onap.validation.yaml.YamlLoadingUtils.YAML_DOCUMENT_WITH_MISSING_FIELD_AND_WRONG_VALUE_INDEX;
+import static org.onap.validation.yaml.YamlLoadingUtils.YAML_DOCUMENT_WITH_MISSING_FIELD_INDEX;
+
+class YamlValidationProcessTest {
+
+    @Test
+    void shouldReturnNoErrorWhenProcessingValidPmDictionaryYaml()
+            throws YamlProcessingException {
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0));
+        YamlDocument document = documents.get(VALID_YAML_DOCUMENT_INDEX);
+
+        // when
+        List<SchemaValidationError> errors = new YamlValidationProcess(schema, document).validate();
+
+        // then
+        assertThat(errors).isEmpty();
+    }
+
+    @Test
+    void shouldReturnOneErrorWhenProcessingPmDictionaryYamlWithMissingField()
+            throws YamlProcessingException {
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0));
+        YamlDocument document = documents.get(YAML_DOCUMENT_WITH_MISSING_FIELD_INDEX);
+
+        // when
+        List<SchemaValidationError> errors = new YamlValidationProcess(schema, document).validate();
+
+        // then
+        assertThat(errors).hasSize(1);
+    }
+
+    @Test
+    void shouldReturnTwoErrorsWhenProcessingPmDictionaryYamlWithMissingFieldAndIncorrectValue()
+            throws YamlProcessingException {
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(documents.get(0));
+        YamlDocument document = documents.get(YAML_DOCUMENT_WITH_MISSING_FIELD_AND_WRONG_VALUE_INDEX);
+
+        // when
+        List<SchemaValidationError> errors = new YamlValidationProcess(schema, document).validate();
+
+        // then
+        assertThat(errors).hasSize(2);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenProcessingPmDictionaryIsNotValidYaml()
+            throws YamlProcessingException {
+        // given
+        List<YamlDocument> documents = YamlLoadingUtils.loadValidMultiDocumentYamlFile();
+        YamlDocument schemaInYaml = YamlLoadingUtils.loadSimpleInvalidYamlSchemaForLazyLoadingFile();
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(schemaInYaml);
+        YamlDocument document = documents.get(VALID_YAML_DOCUMENT_INDEX);
+
+        // when then
+        assertThatThrownBy(() -> new YamlValidationProcess(schema, document).validate())
+                .isInstanceOf(YamlProcessingException.class)
+                .hasMessageContaining(String.format("Lazy loading failed, due to yaml parsing exception."));
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/YamlSchemaFactoryTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/YamlSchemaFactoryTest.java
new file mode 100644
index 0000000..5768851
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/YamlSchemaFactoryTest.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema;
+
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.YamlLoadingUtils;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.schema.node.YamlSchemaNode;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.onap.validation.yaml.model.YamlDocumentFactory.YamlDocumentParsingException;
+import static org.onap.validation.yaml.schema.node.YamlSchemaNodeFactory.EMPTY_COMMENT;
+import static org.onap.validation.yaml.schema.node.YamlSchemaNodeFactoryTest.assertThatBranchNodeIsValid;
+import static org.onap.validation.yaml.schema.node.YamlSchemaNodeFactoryTest.assertThatLeafNodeIsValid;
+
+
+class YamlSchemaFactoryTest {
+
+    @Test
+    void shouldCreateYamlSchemaFromYamlDocumentWithMultipleRoots()
+            throws YamlProcessingException {
+
+        // given
+        YamlDocument documents = YamlLoadingUtils.loadSimpleValidYamlSchemaWithMultiRootFile();
+
+        // when
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(documents);
+
+        // then
+        assertThat(schema).isNotNull();
+        assertThat(schema.getRootNodes()).hasSize(3);
+        assertThat(schema.getRootNodes().get(0).getName()).isEqualTo("root1");
+        assertThat(schema.getRootNodes().get(1).getName()).isEqualTo("root2");
+        assertThat(schema.getRootNodes().get(2).getName()).isEqualTo("root3");
+    }
+
+
+    @Test
+    void shouldCreateYamlSchemaFromYamlDocument()
+            throws YamlProcessingException {
+
+        // given
+        YamlDocument documents = YamlLoadingUtils.loadSimpleValidYamlSchemaFile();
+
+        // when
+        YamlSchema schema = new YamlSchemaFactory().createTreeStructuredYamlSchema(documents);
+
+        // then
+        assertThat(schema).isNotNull();
+        assertThat(schema.getRootNodes()).hasSize(1);
+        YamlSchemaNode pmMetaData = schema.getRootNodes().get(0);
+        assertThatBranchNodeIsValid(pmMetaData, "pmMetaData", "/", true, EMPTY_COMMENT,
+                2);
+
+        YamlSchemaNode pmHeader = pmMetaData.getNextNodes().get(1);
+        assertThatBranchNodeIsValid(pmHeader, "pmHeader", "/pmMetaData/", true, EMPTY_COMMENT,
+                1);
+
+        YamlSchemaNode nfType = pmHeader.getNextNodes().get(0);
+        assertThatLeafNodeIsValid(nfType, "nfType", "/pmMetaData/pmHeader/", true, "nfType comment");
+
+        YamlSchemaNode pmFields = pmMetaData.getNextNodes().get(0);
+        assertThatBranchNodeIsValid(pmFields, "pmFields", "/pmMetaData/", true, EMPTY_COMMENT,
+                2);
+
+        YamlSchemaNode measChangeType = pmFields.getNextNodes().get(1);
+        assertThatLeafNodeIsValid(measChangeType, "measChangeType", "/pmMetaData/pmFields/",
+                true, "measChangeType comment",
+                "added", "modified", "deleted");
+
+        YamlSchemaNode measAdditionalFields = pmFields.getNextNodes().get(0);
+        assertThatBranchNodeIsValid(measAdditionalFields, "measAdditionalFields", "/pmMetaData/pmFields/",
+                true, "measAdditionalFields comment",
+                2);
+
+        YamlSchemaNode vendorField1 = measAdditionalFields.getNextNodes().get(0);
+        assertThatLeafNodeIsValid(vendorField1, "vendorField1", "/pmMetaData/pmFields/measAdditionalFields/",
+                true, "vendorField1 comment",
+                "X", "Y", "Z");
+        YamlSchemaNode vendorField2 = measAdditionalFields.getNextNodes().get(1);
+        assertThatLeafNodeIsValid(vendorField2, "vendorField2", "/pmMetaData/pmFields/measAdditionalFields/",
+                false, "vendorField2 comment",
+                "A", "B");
+    }
+
+    @Test
+    void shouldThrowYamlParsingExceptionWhenLoadedSchemaIsInvalid()
+            throws YamlDocumentParsingException {
+
+        // given
+        YamlDocument documents = YamlLoadingUtils.loadSimpleInvalidYamlSchemaFile();
+
+        // when/then
+        assertThatThrownBy(() -> new YamlSchemaFactory().createTreeStructuredYamlSchema(documents))
+                .isInstanceOf(YamlDocumentParsingException.class)
+                .hasMessageContaining(String.format(
+                        "Fail to parse given objects: %s as yaml document",
+                        documents.getSubStructure("pmMetaData").getYaml().get("structure"))
+                );
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactoryTest.java b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactoryTest.java
new file mode 100644
index 0000000..ed43a1d
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/java/org/onap/validation/yaml/schema/node/YamlSchemaNodeFactoryTest.java
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2020 Nokia
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onap.validation.yaml.schema.node;
+
+import org.assertj.core.util.Lists;
+import org.junit.jupiter.api.Test;
+import org.onap.validation.yaml.YamlLoadingUtils;
+import org.onap.validation.yaml.exception.YamlProcessingException;
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.onap.validation.yaml.schema.node.YamlSchemaNodeFactory.EMPTY_COMMENT;
+
+public class YamlSchemaNodeFactoryTest {
+
+    private static final String ROOT_PATH = "/";
+
+    @Test
+    void shouldThrowExceptionDuringLazyLoadingWhenLoadedSchemaHaveInvalidSubStructure()
+            throws YamlProcessingException {
+        // given
+        String nodeName = "pmMetaData";
+
+        YamlDocument document = YamlLoadingUtils.loadSimpleInvalidYamlSchemaForLazyLoadingFile();
+        YamlSchemaNode node = new YamlSchemaNodeFactory()
+                .createNode(nodeName, ROOT_PATH, document.getSubStructure(nodeName));
+
+        // when/then
+        assertThatThrownBy(node::getNextNodes)
+                .isInstanceOf(YamlSchemaNode.YamlSchemaProcessingException.class)
+                .hasMessageContaining("Lazy loading failed, due to yaml parsing exception.");
+    }
+
+    @Test
+    void shouldCreateLeafNodeIfGivenYamlDocumentHaveNoSubStructure()
+            throws YamlProcessingException {
+        // given
+        String nodeName = "leaf_test";
+        String comment = "test leaf node";
+        List<String> acceptedValues = Lists.list("val1", "val2");
+        Map<Object, Object> nodeInYamlFormat = new HashMap<>();
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.PRESENCE_KEY, YamlSchemaNodeFactory.PRESENCE_REQUIRED_KEY);
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.COMMENT_KEY, comment);
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.VALUE_KET, acceptedValues);
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(nodeInYamlFormat);
+
+        // when
+        YamlSchemaNode yamlSchemaNode = new YamlSchemaNodeFactory().createNode(nodeName, ROOT_PATH, document);
+
+        // then
+        assertThatLeafNodeIsValid(
+                yamlSchemaNode, nodeName, ROOT_PATH, true, comment,
+                acceptedValues.toArray(new String[acceptedValues.size()])
+        );
+    }
+
+    @Test
+    void shouldCreateBranchNodeIfGivenYamlDocumentHaveSubStructure()
+            throws YamlProcessingException {
+        // given
+        String nodeName = "branch_test";
+        String comment = "test branch node";
+
+        Map<Object, Object> subStructure = new HashMap<>();
+        String subNode1Name = "branch_test_node1";
+        String subNode2Name = "branch_test_node2";
+        subStructure.put(subNode1Name, new HashMap<>());
+        subStructure.put(subNode2Name, new HashMap<>());
+
+        Map<Object, Object> nodeInYamlFormat = new HashMap<>();
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.PRESENCE_KEY, YamlSchemaNodeFactory.PRESENCE_REQUIRED_KEY);
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.COMMENT_KEY, comment);
+        nodeInYamlFormat.put(YamlSchemaNodeFactory.STRUCTURE_KEY, subStructure);
+        YamlDocument document = new YamlDocumentFactory().createYamlDocument(nodeInYamlFormat);
+
+        // when
+        YamlSchemaNode yamlSchemaNode = new YamlSchemaNodeFactory().createNode(nodeName, ROOT_PATH, document);
+
+        // then
+        assertThatBranchNodeIsValid(yamlSchemaNode, nodeName, ROOT_PATH, true, comment, 2);
+
+        List<YamlSchemaNode> subNodes = yamlSchemaNode.getNextNodes();
+        assertThat(subNodes).hasSize(2);
+        assertThatLeafNodeIsValid(
+                subNodes.get(1), subNode1Name, ROOT_PATH + nodeName + "/", false, EMPTY_COMMENT);
+        assertThatLeafNodeIsValid(
+                subNodes.get(0), subNode2Name, ROOT_PATH + nodeName + "/", false, EMPTY_COMMENT);
+    }
+
+    public static void assertThatBranchNodeIsValid(
+            YamlSchemaNode yamlSchemaNode, String name, String path, boolean isRequired, String comment,
+            int numberOfSubNodes
+    ) throws YamlSchemaNode.YamlSchemaProcessingException {
+        assertThatNodeIsValid(yamlSchemaNode, name, path, isRequired, comment);
+
+        assertThat(yamlSchemaNode.getClass()).isEqualTo(YamlSchemaBranchNode.class);
+        assertThat(yamlSchemaNode.isContainingSubStructure()).isTrue();
+        assertThat(yamlSchemaNode.getNextNodes()).hasSize(numberOfSubNodes);
+        assertThat(yamlSchemaNode.getAcceptedValues()).isEmpty();
+    }
+
+    public static void assertThatLeafNodeIsValid(
+            YamlSchemaNode yamlSchemaNode, String name, String path, boolean isRequired, String comment,
+            String... acceptedValues
+    ) throws YamlSchemaNode.YamlSchemaProcessingException {
+        assertThatNodeIsValid(yamlSchemaNode, name, path, isRequired, comment);
+
+        assertThat(yamlSchemaNode.getClass()).isEqualTo(YamlSchemaLeafNode.class);
+        assertThat(yamlSchemaNode.isContainingSubStructure()).isFalse();
+        assertThat(yamlSchemaNode.getAcceptedValues()).containsExactly(acceptedValues);
+        assertThat(yamlSchemaNode.getNextNodes()).isEmpty();
+    }
+
+    private static void assertThatNodeIsValid(YamlSchemaNode yamlSchemaNode, String name, String path, boolean isRequired, String comment) {
+        assertThat(yamlSchemaNode).isNotNull();
+        assertThat(yamlSchemaNode.getName()).isEqualTo(name);
+        assertThat(yamlSchemaNode.getPath()).isEqualTo(path);
+        if (comment.isEmpty()) {
+            assertThat(yamlSchemaNode.getComment()).isNotEmpty();
+        } else {
+            assertThat(yamlSchemaNode.getComment()).isEqualTo(comment);
+        }
+        assertThat(yamlSchemaNode.isRequired()).isEqualTo(isRequired);
+    }
+}
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Multi_Document_Invalid.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Multi_Document_Invalid.yaml
new file mode 100644
index 0000000..aab34fa
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Multi_Document_Invalid.yaml
@@ -0,0 +1,86 @@
+...
+# PM Dictionary perf3gpp measurements for the gnb-Nokia NF (bracket style yaml)
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2204,
+    iMeasType: 1,
+
+    measCollectionMethod: CC,
+    measCondition: "This measurement is updated when X2AP: SgNB Modification Required message is sent to MeNB
+                      with the SCG Change Indication set as PSCellChange.",
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change attempts.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G18A_1807_003,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: integer,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChAttempt,
+    measAdditionalFields: {
+      vendorField1: X,
+      vendorField2: B
+    }
+  }
+}
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2204,
+    iMeasType: 2,
+    measCollectionMethod: CC,
+    measCondition: "This measurement is updated when the TDCoverall timer has elapsed before gNB receives the X2AP: SgNB Modification Confirm message.",
+    measDescription: "This measurement the number of intra gNB intra frequency PSCell change failures due to TDCoverall timer expiry.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G18A_1807_003,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: float,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChFailTdcExp,
+    measAdditionalFields: {
+      vendorField1: Y
+    }
+  }
+}
+...
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2206,
+    iMeasType: 1,
+    measCondition: "This measurement is updated when MeNB replies to X2AP: SgNB Modification Required message with the X2AP: SgNB Modification Refuse message.",
+    measCollectionMethod: CC,
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change failures due to MeNB refusal.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G19_1906_002,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: float,
+    measChangeType: added,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChFailMenbRef,
+    measAdditionalFields: {
+      vendorField1: Z,
+      vendorField2: A
+    }
+  }
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary.yaml
new file mode 100644
index 0000000..12a4af9
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary.yaml
@@ -0,0 +1,228 @@
+---
+# PM Dictionary schema specifying and describing the meta information
+# used to define perf3gpp measurements in the PM Dictionary
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "NF type; should match the nfName-vendor string used in
+                      the fileReady or perf3gpp eventName"
+      },
+      pmDefSchemaVsn: {
+        presence: required,
+        value: 2.0,
+        comment: "PM Dictionary Schema Version from the VES Event
+                      Registration specification"
+      },
+      pmDefVsn: {
+        presence: required,
+        comment: "vendor-defined PM Dictionary version"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: {
+      iMeasInfoId: {
+        presence: required,
+        comment: "vendor-defined integer measurement group identifier"
+      },
+      iMeasType: {
+        presence: required,
+        comment: "vendor-defined integer identifier for the measType;
+                      must be combined with measInfoId to identify a
+                      specific measurement."
+      },
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "indicates the type of change that occurred during
+                      measLastChange"
+      },
+      measCollectionMethod: {
+        presence: required,
+        value: [CC, SI, DER, Gauge, Average],
+        comment: "the measurement collection method; CC, SI, DER and
+                      Gauge are as defined in 3GPP; average contains the
+                      average value of the measurement during the
+                      granularity period"
+      },
+      measCondition: {
+        presence: required,
+        comment: "description of the condition causing the measurement"
+      },
+      measDescription: {
+        presence: required,
+        comment: "description of the measurement information
+                      and purpose"
+      },
+      measFamily: {
+        presence: required,
+        comment: "abbreviation for a family of measurements, in
+                      3GPP format, or vendor defined"
+      },
+      measInfoId: {
+        presence: required,
+        comment: "name for a group of related measurements in
+                      3GPP format or vendor defined"
+      },
+      measLastChange: {
+        presence: required,
+        comment: "version of the PM Dictionary the last time this
+                      measurement was added, modified or deleted"
+      },
+      measObjClass: {
+        presence: required,
+        value: [NGBTS, NGCELL, IPNO, IPSEC, ETHIF],
+        comment: "measurement object class"
+      },
+      measResultRange: {
+        presence: optional,
+        comment: "range of the measurement result; only necessary when
+                      the range is smaller than the full range of the
+                      data type"
+      },
+      measResultType: {
+        presence: required,
+        value: [float, uint32, uint64],
+        comment: "data type of the measurement result"
+      },
+      measResultUnits: {
+        presence: required,
+        value: [seconds, minutes, nanoseconds, microseconds, dB,
+                number, kilobytes, bytes, ethernetFrames,
+                packets, users],
+        comment: "units of measure for the measurement result"
+      },
+      measType: {
+        presence: required,
+        comment: "measurement name in 3GPP or vendor-specific format;
+                      vendor specific names are preceded with VS"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "vendor-specific PM Dictionary fields",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendor field 1 description"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendor field 2 description."
+          }
+        }
+      }
+    }
+  }
+}}
+...
+# PM Dictionary perf3gpp measurements for the gnb-Nokia NF (bracket style yaml)
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2204
+    iMeasType: 1
+    measCollectionMethod: CC
+    measCondition: "This measurement is updated when X2AP: SgNB Modification Required message is sent to MeNB
+                      with the SCG Change Indication set as PSCellChange."
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change attempts."
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G18A_1807_003
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: integer
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChAttempt
+    measAdditionalFields:
+      vendorField1: X
+      vendorField2: B
+...
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2204
+    iMeasType: 2
+    measCollectionMethod: CC
+    measCondition: "This measurement is updated when the TDCoverall timer has elapsed before gNB receives the X2AP: SgNB Modification Confirm message."
+    measDescription: "This measurement the number of intra gNB intra frequency PSCell change failures due to TDCoverall timer expiry."
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G18A_1807_003
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: float
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChFailTdcExp
+    measAdditionalFields:
+      vendorField1:
+        - Y
+        - X
+...
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2206
+    iMeasType: 1
+    measCondition: "This measurement is updated when MeNB replies to X2AP: SgNB Modification Required message with the X2AP: SgNB Modification Refuse message."
+    measCollectionMethod: CC
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change failures due to MeNB refusal."
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G19_1906_002
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: float
+    measChangeType: added
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChFailMenbRef
+    measAdditionalFields:
+      vendorField1:
+        - Z
+        - A
+      vendorField2: A
+...
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2206
+    iMeasType: 1
+    measCondition: "This measurement is updated when MeNB replies to X2AP: SgNB Modification Required message with the X2AP: SgNB Modification Refuse message."
+    measCollectionMethod: CC
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change failures due to MeNB refusal."
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G19_1906_002
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: float
+    measChangeType: added
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChFailMenbRef
+    measAdditionalFields:
+      vendorField1:
+        - X
+        - Y
+      vendorField2: A
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary_JSON_Style.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary_JSON_Style.yaml
new file mode 100644
index 0000000..f4cbddf
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/PM_Dictionary_JSON_Style.yaml
@@ -0,0 +1,239 @@
+---
+# PM Dictionary schema specifying and describing the meta information
+# used to define perf3gpp measurements in the PM Dictionary
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "NF type; should match the nfName-vendor string used in
+                      the fileReady or perf3gpp eventName"
+      },
+      pmDefSchemaVsn: {
+        presence: required,
+        value: 2.0,
+        comment: "PM Dictionary Schema Version from the VES Event
+                      Registration specification"
+      },
+      pmDefVsn: {
+        presence: required,
+        comment: "vendor-defined PM Dictionary version"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: {
+      iMeasInfoId: {
+        presence: required,
+        comment: "vendor-defined integer measurement group identifier"
+      },
+      iMeasType: {
+        presence: required,
+        comment: "vendor-defined integer identifier for the measType;
+                      must be combined with measInfoId to identify a
+                      specific measurement."
+      },
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "indicates the type of change that occurred during
+                      measLastChange"
+      },
+      measCollectionMethod: {
+        presence: required,
+        value: [CC, SI, DER, Gauge, Average],
+        comment: "the measurement collection method; CC, SI, DER and
+                      Gauge are as defined in 3GPP; average contains the
+                      average value of the measurement during the
+                      granularity period"
+      },
+      measCondition: {
+        presence: required,
+        comment: "description of the condition causing the measurement"
+      },
+      measDescription: {
+        presence: required,
+        comment: "description of the measurement information
+                      and purpose"
+      },
+      measFamily: {
+        presence: required,
+        comment: "abbreviation for a family of measurements, in
+                      3GPP format, or vendor defined"
+      },
+      measInfoId: {
+        presence: required,
+        comment: "name for a group of related measurements in
+                      3GPP format or vendor defined"
+      },
+      measLastChange: {
+        presence: required,
+        comment: "version of the PM Dictionary the last time this
+                      measurement was added, modified or deleted"
+      },
+      measObjClass: {
+        presence: required,
+        value: [NGBTS, NGCELL, IPNO, IPSEC, ETHIF],
+        comment: "measurement object class"
+      },
+      measResultRange: {
+        presence: optional,
+        comment: "range of the measurement result; only necessary when
+                      the range is smaller than the full range of the
+                      data type"
+      },
+      measResultType: {
+        presence: required,
+        value: [float, uint32, uint64],
+        comment: "data type of the measurement result"
+      },
+      measResultUnits: {
+        presence: required,
+        value: [seconds, minutes, nanoseconds, microseconds, dB,
+                number, kilobytes, bytes, ethernetFrames,
+                packets, users],
+        comment: "units of measure for the measurement result"
+      },
+      measType: {
+        presence: required,
+        comment: "measurement name in 3GPP or vendor-specific format;
+                      vendor specific names are preceded with VS"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "vendor-specific PM Dictionary fields",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendor field 1 description"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendor field 2 description."
+          }
+        }
+      }
+    }
+  }
+}}
+...
+# PM Dictionary perf3gpp measurements for the gnb-Nokia NF (bracket style yaml)
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2204,
+    iMeasType: 1,
+
+    measCollectionMethod: CC,
+    measCondition: "This measurement is updated when X2AP: SgNB Modification Required message is sent to MeNB
+                      with the SCG Change Indication set as PSCellChange.",
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change attempts.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G18A_1807_003,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: integer,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChAttempt,
+    measAdditionalFields: {
+      vendorField1: X,
+      vendorField2: B
+    }
+  }
+}
+...
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2204,
+    iMeasType: 2,
+    measCollectionMethod: CC,
+    measCondition: "This measurement is updated when the TDCoverall timer has elapsed before gNB receives the X2AP: SgNB Modification Confirm message.",
+    measDescription: "This measurement the number of intra gNB intra frequency PSCell change failures due to TDCoverall timer expiry.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G18A_1807_003,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: float,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChFailTdcExp,
+    measAdditionalFields: {
+      vendorField1: [Y,Z]
+    }
+  }
+}
+...
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2206,
+    iMeasType: 1,
+    measCondition: "This measurement is updated when MeNB replies to X2AP: SgNB Modification Required message with the X2AP: SgNB Modification Refuse message.",
+    measCollectionMethod: CC,
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change failures due to MeNB refusal.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G19_1906_002,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: float,
+    measChangeType: added,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChFailMenbRef,
+    measAdditionalFields: {
+      vendorField1: [Z,A],
+      vendorField2: A
+    }
+  }
+}
+...
+---
+pmMetaData: {
+  pmHeader: {
+    nfType: gnb-Nokia,
+    pmDefSchemaVsn: 2.0,
+    pmDefVsn: 5G19_1906_002
+  },
+  pmFields: {
+    iMeasInfoId: 2206,
+    iMeasType: 1,
+    measCondition: "This measurement is updated when MeNB replies to X2AP: SgNB Modification Required message with the X2AP: SgNB Modification Refuse message.",
+    measCollectionMethod: CC,
+    measDescription: "This counter indicates the number of intra gNB intra frequency PSCell change failures due to MeNB refusal.",
+    measFamily: NINFC,
+    measInfoId: "NR Intra Frequency PSCell Change",
+    measLastChange: 5G19_1906_002,
+    measObjClass: NGCELL,
+    measResultRange: 0-4096,
+    measResultType: float,
+    measChangeType: added,
+    measResultUnits: number,
+    measType: VS.NINFC.IntraFrPscelChFailMenbRef,
+    measAdditionalFields: {
+      vendorField1: [X,Y],
+      vendorField2: A
+    }
+  }
+}
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Mapping_Value.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Mapping_Value.yaml
new file mode 100644
index 0000000..25c72cd
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Mapping_Value.yaml
@@ -0,0 +1,149 @@
+---
+# PM Dictionary schema specifying and describing the meta information
+# used to define perf3gpp measurements in the PM Dictionary
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "NF type; should match the nfName-vendor string used in
+                      the fileReady or perf3gpp eventName"
+      },
+      pmDefSchemaVsn: {
+        presence: required,
+        value: 2.0,
+        comment: "PM Dictionary Schema Version from the VES Event
+                      Registration specification"
+      },
+      pmDefVsn: {
+        presence: required,
+        comment: "vendor-defined PM Dictionary version"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: {
+      iMeasInfoId: {
+        presence: required,
+        comment: "vendor-defined integer measurement group identifier"
+      },
+      iMeasType: {
+        presence: required,
+        comment: "vendor-defined integer identifier for the measType;
+                      must be combined with measInfoId to identify a
+                      specific measurement."
+      },
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "indicates the type of change that occurred during
+                      measLastChange"
+      },
+      measCollectionMethod: {
+        presence: required,
+        value: [CC, SI, DER, Gauge, Average],
+        comment: "the measurement collection method; CC, SI, DER and
+                      Gauge are as defined in 3GPP; average contains the
+                      average value of the measurement during the
+                      granularity period"
+      },
+      measCondition: {
+        presence: required,
+        comment: "description of the condition causing the measurement"
+      },
+      measDescription: {
+        presence: required,
+        comment: "description of the measurement information
+                      and purpose"
+      },
+      measFamily: {
+        presence: required,
+        comment: "abbreviation for a family of measurements, in
+                      3GPP format, or vendor defined"
+      },
+      measInfoId: {
+        presence: required,
+        comment: "name for a group of related measurements in
+                      3GPP format or vendor defined"
+      },
+      measLastChange: {
+        presence: required,
+        comment: "version of the PM Dictionary the last time this
+                      measurement was added, modified or deleted"
+      },
+      measObjClass: {
+        presence: required,
+        value: [NGBTS, NGCELL, IPNO, IPSEC, ETHIF],
+        comment: "measurement object class"
+      },
+      measResultRange: {
+        presence: optional,
+        comment: "range of the measurement result; only necessary when
+                      the range is smaller than the full range of the
+                      data type"
+      },
+      measResultType: {
+        presence: required,
+        value: [float, uint32, uint64],
+        comment: "data type of the measurement result"
+      },
+      measResultUnits: {
+        presence: required,
+        value: [seconds, minutes, nanoseconds, microseconds, dB,
+                number, kilobytes, bytes, ethernetFrames,
+                packets, users],
+        comment: "units of measure for the measurement result"
+      },
+      measType: {
+        presence: required,
+        comment: "measurement name in 3GPP or vendor-specific format;
+                      vendor specific names are preceded with VS"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "vendor-specific PM Dictionary fields",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendor field 1 description"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendor field 2 description."
+          }
+        }
+      }
+    }
+  }
+}}
+...
+# PM Dictionary perf3gpp measurements for the gnb-Nokia NF (bracket style yaml)
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2204
+    iMeasType: 1
+    measCollectionMethod: CC
+    measCondition: This measurement is updated when X2AP: SgNB Modification Required message is sent to MeNB
+                      with the SCG Change Indication set as PSCellChange.
+    measDescription: This counter indicates the number of intra gNB intra frequency PSCell change attempts.
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G18A_1807_003
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: integer
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChAttempt
+    measAdditionalFields:
+      vendorField1: X
+      vendorField2: B
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_Construction.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_Construction.yaml
new file mode 100644
index 0000000..c5e7b7c
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_Construction.yaml
@@ -0,0 +1,39 @@
+---
+pmMetaData: { presence: required, structure: [
+  -pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "nfType comment"
+      }
+    }
+  },
+  -pmFields: {
+    presence: required,
+    structure: {
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "measChangeType comment"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "measAdditionalFields comment",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendorField1 comment"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendorField2 comment"
+          }
+        }
+      }
+    }
+  }
+]}
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_LazyLoading.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_LazyLoading.yaml
new file mode 100644
index 0000000..7f9f946
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Invalid_Schema_LazyLoading.yaml
@@ -0,0 +1,39 @@
+---
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "nfType comment"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: [
+      -measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "measChangeType comment"
+      },
+      -measAdditionalFields: {
+        presence: required,
+        comment: "measAdditionalFields comment",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendorField1 comment"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendorField2 comment"
+          }
+        }
+      }
+    ]
+  }
+}}
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Unknown_Escape_Character.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Unknown_Escape_Character.yaml
new file mode 100644
index 0000000..2cac9e6
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Unknown_Escape_Character.yaml
@@ -0,0 +1,149 @@
+---
+# PM Dictionary schema specifying and describing the meta information
+# used to define perf3gpp measurements in the PM Dictionary
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "NF type; should match the nfName-vendor string used in
+                      the fileReady or perf3gpp eventName"
+      },
+      pmDefSchemaVsn: {
+        presence: required,
+        value: 2.0,
+        comment: "PM Dictionary Schema Version from the VES Event
+                      Registration specification"
+      },
+      pmDefVsn: {
+        presence: required,
+        comment: "vendor-defined PM Dictionary version"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: {
+      iMeasInfoId: {
+        presence: required,
+        comment: "vendor-defined integer measurement group identifier"
+      },
+      iMeasType: {
+        presence: required,
+        comment: "vendor-defined integer identifier for the measType;
+                      must be combined with measInfoId to identify a
+                      specific measurement."
+      },
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "indicates the type of change that occurred during
+                      measLastChange"
+      },
+      measCollectionMethod: {
+        presence: required,
+        value: [CC, SI, DER, Gauge, Average],
+        comment: "the measurement collection method; CC, SI, DER and
+                      Gauge are as defined in 3GPP; average contains the
+                      average value of the measurement during the
+                      granularity period"
+      },
+      measCondition: {
+        presence: required,
+        comment: "description of the condition causing the measurement"
+      },
+      measDescription: {
+        presence: required,
+        comment: "description of the measurement information
+                      and purpose"
+      },
+      measFamily: {
+        presence: required,
+        comment: "abbreviation for a family of measurements, in
+                      3GPP format, or vendor defined"
+      },
+      measInfoId: {
+        presence: required,
+        comment: "name for a group of related measurements in
+                      3GPP format or vendor defined"
+      },
+      measLastChange: {
+        presence: required,
+        comment: "version of the PM Dictionary the last time this
+                      measurement was added, modified or deleted"
+      },
+      measObjClass: {
+        presence: required,
+        value: [NGBTS, NGCELL, IPNO, IPSEC, ETHIF],
+        comment: "measurement object class"
+      },
+      measResultRange: {
+        presence: optional,
+        comment: "range of the measurement result; only necessary when
+                      the range is smaller than the full range of the
+                      data type"
+      },
+      measResultType: {
+        presence: required,
+        value: [float, uint32, uint64],
+        comment: "data type of the measurement result"
+      },
+      measResultUnits: {
+        presence: required,
+        value: [seconds, minutes, nanoseconds, microseconds, dB,
+                number, kilobytes, bytes, ethernetFrames,
+                packets, users],
+        comment: "units of measure for the measurement result"
+      },
+      measType: {
+        presence: required,
+        comment: "measurement name in 3GPP or vendor-specific format;
+                      vendor specific names are preceded with VS"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "vendor-specific PM Dictionary fields",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendor field 1 description"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendor field 2 description."
+          }
+        }
+      }
+    }
+  }
+}}
+...
+# PM Dictionary perf3gpp measurements for the gnb-Nokia NF (bracket style yaml)
+---
+pmMetaData:
+  pmHeader:
+    nfType: gnb-Nokia
+    pmDefSchemaVsn: 2.0
+    pmDefVsn: 5G19_1906_002
+  pmFields:
+    iMeasInfoId: 2204
+    iMeasType: 1
+    measCollectionMethod: CC
+    measCondition: "This measurement is updated when X2AP: SgNB Modification Required message is \sent\ to MeNB
+                     with the SCG Change Indication set as PSCellChange."
+    measDescription: This counter indicates the number of intra gNB intra frequency PSCell change attempts.
+    measFamily: NINFC
+    measInfoId: "NR Intra Frequency PSCell Change"
+    measLastChange: 5G18A_1807_003
+    measObjClass: NGCELL
+    measResultRange: 0-4096
+    measResultType: integer
+    measResultUnits: number
+    measType: VS.NINFC.IntraFrPscelChAttempt
+    measAdditionalFields:
+      vendorField1: X
+      vendorField2: B
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema.yaml
new file mode 100644
index 0000000..a125b13
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema.yaml
@@ -0,0 +1,39 @@
+---
+pmMetaData: { presence: required, structure: {
+  pmHeader: {
+    presence: required,
+    structure: {
+      nfType: {
+        presence: required,
+        comment: "nfType comment"
+      }
+    }
+  },
+  pmFields: {
+    presence: required,
+    structure: {
+      measChangeType: {
+        presence: required,
+        value: [added, modified, deleted],
+        comment: "measChangeType comment"
+      },
+      measAdditionalFields: {
+        presence: required,
+        comment: "measAdditionalFields comment",
+        structure: {
+          vendorField1: {
+            presence: required,
+            value: [X, Y, Z],
+            comment: "vendorField1 comment"
+          },
+          vendorField2: {
+            presence: optional,
+            value: [A, B],
+            comment: "vendorField2 comment"
+          }
+        }
+      }
+    }
+  }
+}}
+...
diff --git a/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema_Multi_Root.yaml b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema_Multi_Root.yaml
new file mode 100644
index 0000000..d73ca4f
--- /dev/null
+++ b/pmdictionaryvalidation/src/test/resources/yaml_schema/Simple_Valid_Schema_Multi_Root.yaml
@@ -0,0 +1,23 @@
+---
+root1: { presence: required, structure: {
+  field1: {
+    presence: required,
+    value: [X, Y, Z],
+    comment: "field 1 description"
+  }
+}}
+root2: { presence: required, structure: {
+  field2: {
+    presence: required,
+    value: [X, Y, Z],
+    comment: "field 1 description"
+  }
+}}
+root3: { presence: required, structure: {
+  field3: {
+    presence: required,
+    value: [X, Y, Z],
+    comment: "field 1 description"
+  }
+}}
+...