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diff --git a/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodel.js b/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodel.js
new file mode 100644
index 0000000000..82e8ada588
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+++ b/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodel.js
@@ -0,0 +1,94 @@
+/*!
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.
+ */
+
+import _merge from 'lodash/merge';
+
+import Common from '../common/Common';
+
+/**
+ * Rules governing what a definition can contain.
+ */
+export default class Metamodel {
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Construct from JSON definition.
+   * @param json schema definition.
+   */
+  constructor(json) {
+    Common.assertType(json, 'Object');
+    const dfault = require('./templates/default.metamodel.json');
+    this.json = _merge({}, dfault, json);
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get schema identifier.
+   * @returns ID.
+   */
+  getId() {
+    return this.json.diagram.metadata.id;
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get lifeline constraints.
+   * @returns {*}
+   */
+  getConstraints() {
+    return this.json.diagram.lifelines.constraints;
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get lifeline metadata by lifeline ID.
+   * @param id sought lifeline.
+   * @returns lifeline if found.
+   */
+  getLifelineById(id) {
+    for (const lifeline of this.json.diagram.lifelines.lifelines) {
+      if (lifeline.id === id) {
+        return lifeline;
+      }
+    }
+    return undefined;
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get original JSON.
+   * @returns JSON.
+   */
+  unwrap() {
+    return this.json;
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get default schema.
+   * @returns Metamodel default (permissive) Metamodel.
+   */
+  static getDefault() {
+    return new Metamodel({});
+  }
+
+}