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diff --git a/src/main/java/org/onap/crud/event/envelope/GraphEventEnvelope.java b/src/main/java/org/onap/crud/event/envelope/GraphEventEnvelope.java
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+/**
+ * ============LICENSE_START=======================================================
+ * Gizmo
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.crud.event.envelope;
+
+import javax.ws.rs.core.Response;
+import org.onap.crud.event.GraphEvent;
+import org.onap.crud.event.GraphEventEdge;
+import org.onap.crud.event.GraphEventVertex;
+import org.onap.crud.exception.CrudException;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+
+/**
+ * Defines the top-level structure of the Gizmo events. Primarily serves as a wrapper for the graph details and includes
+ * an event header to describe and identify the event.
+ */
+public class GraphEventEnvelope {
+
+    private GraphEventHeader header;
+    private GraphEvent body;
+    private JsonElement policyViolations;
+
+    private static final Gson gson = new GsonBuilder().disableHtmlEscaping().setPrettyPrinting().create();
+
+    /**
+     * Construct the event.
+     *
+     * @param header the event header to describe the event
+     * @param body the body of the event with graph details
+     */
+    public GraphEventEnvelope(GraphEventHeader header, GraphEvent body) {
+        this.header = header;
+        this.body = body;
+    }
+
+    /**
+     * Construct the envelope header from the provided GraphEvent.
+     *
+     * @param event the graph event for a vertex or edge operation
+     */
+    public GraphEventEnvelope(GraphEvent event) {
+        this.header = new GraphEventHeader.Builder().requestId(event.getTransactionId())
+                .validationEntityType(getType(event)).build();
+        this.body = event;
+    }
+
+    public GraphEvent getBody() {
+        return body;
+    }
+
+    public GraphEventHeader getHeader() {
+        return header;
+    }
+
+    public JsonElement getPolicyViolations() {
+        return policyViolations != null ? policyViolations : new JsonArray();
+    }
+
+    /**
+     * Serializes this object into a JSON string representation.
+     *
+     * @return a JSON format string representation of this object.
+     */
+    public String toJson() {
+        return gson.toJson(this);
+    }
+
+    /**
+     * Deserializes a JSON string into a GraphEventEnvelope object.
+     *
+     * @param json the JSON string
+     * @return a GraphEventEnvelope object
+     * @throws CrudException
+     */
+    public static GraphEventEnvelope fromJson(String json) throws CrudException {
+        try {
+            if (json == null || json.isEmpty()) {
+                throw new CrudException("Empty or null JSON string.", Response.Status.BAD_REQUEST);
+            }
+            return gson.fromJson(json, GraphEventEnvelope.class);
+        } catch (Exception ex) {
+            throw new CrudException("Unable to parse JSON string: " + json, Response.Status.BAD_REQUEST);
+        }
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#toString()
+     */
+    @Override
+    public String toString() {
+        return this.toJson();
+    }
+
+    private String getType(GraphEvent event) {
+        GraphEventVertex vertex = event.getVertex();
+        GraphEventEdge edge = event.getEdge();
+        if (vertex != null) {
+            return vertex.getType();
+        } else if (edge != null) {
+            return edge.getType();
+        }
+        return null;
+    }
+
+}