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diff --git a/www/js/query.js b/www/js/query.js
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ *
+ * 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.
+ *
+ */
+
+var Query = Class.extend({
+  /**
+   * @brief Query class
+   * @param action (string) :
+   * @param object_name (string) :
+	 * @param filter (list[tuple(key, op, value)]) :
+   * @param params (dict[field_name, value]) :
+   * @param field_names (list[string])
+   * @return : a Query instance
+   */
+  init: function(action, object_name, filter = null, params = null, field_names = null, last = false)
+  {
+    this._action = action;
+    this._object_name = object_name;
+    this._filter = filter;
+    this._params = params;
+    this._field_names = field_names;
+    this._last = last;
+  },
+
+  /**
+   * @brief : dict representation of a Query
+   * @return : a dict representing the Query
+   */
+  to_dict: function()
+  {
+      query_dict = {
+        'action': this._action,
+        'object_name': this._object_name,
+        'filter': this._filter,
+        'params': this._params,
+        'fields': this._fields,
+        'last': this._last
+      };
+      return query_dict;
+  }
+
+});