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diff --git a/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodels.js b/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodels.js
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+++ b/dox-sequence-diagram-ui/src/main/webapp/lib/ecomp/asdc/sequencer/model/Metamodels.js
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+/*!
+ * 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 Common from '../common/Common';
+import Metamodel from './Metamodel';
+
+/**
+ * A simple lookup for schemas by ID.
+ */
+export default class Metamodels {
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Construct metamodels from provided JSON definitions.
+   * @param metamodels JSON metamodel definitions.
+   */
+  constructor(metamodels) {
+
+    Common.assertType(metamodels, 'Array');
+
+    this.lookup = {};
+
+    // Save each metamodel. It's up to the Metamodel class to make sense of
+    // potentially nonsense metamodel definitions.
+
+    for (const json of metamodels) {
+      const metamodel = new Metamodel(json);
+      this.lookup[metamodel.getId()] = metamodel;
+    }
+
+    // Set (or override) the default metamodel with the inlined one.
+
+    this.lookup.$ = Metamodel.getDefault();
+    Common.assertInstanceOf(this.lookup.$, Metamodel);
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get Metamodel by its @id.
+   * @param id identifier.
+   * @returns Metamodel, or undefined if no matching metamodel found.
+   */
+  getMetamodel(id) {
+    return this.lookup[id];
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get the default (permissive) metamodel.
+   * @returns default Metamodel.
+   */
+  getDefault() {
+    return this.lookup.$;
+  }
+
+  // ///////////////////////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Get metamodel by its @id, falling back to the default.
+   * @param id identifier.
+   * @returns matching metamodel, or default.
+   */
+  getMetamodelOrDefault(id) {
+    const metamodel = this.getMetamodel(id);
+    if (metamodel) {
+      return metamodel;
+    }
+    return this.getDefault();
+  }
+
+}