--- a/labs/openlayers/lib/OpenLayers/Filter.js
+++ b/labs/openlayers/lib/OpenLayers/Filter.js
@@ -1,1 +1,69 @@
+/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
+ * full list of contributors). Published under the Clear BSD license.  
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
 
+
+/**
+ * @requires OpenLayers/Util.js
+ * @requires OpenLayers/Style.js
+ */
+
+/**
+ * Class: OpenLayers.Filter
+ * This class represents an OGC Filter.
+ */
+OpenLayers.Filter = OpenLayers.Class({
+    
+    /** 
+     * Constructor: OpenLayers.Filter
+     * This is an abstract class.  Create an instance of a filter subclass.
+     *
+     * Parameters:
+     * options - {Object} Optional object whose properties will be set on the
+     *     instance.
+     * 
+     * Returns:
+     * {<OpenLayers.Filter>}
+     */
+    initialize: function(options) {
+        OpenLayers.Util.extend(this, options);
+    },
+
+    /** 
+     * APIMethod: destroy
+     * Remove reference to anything added.
+     */
+    destroy: function() {
+    },
+
+    /**
+     * APIMethod: evaluate
+     * Evaluates this filter in a specific context.  Should be implemented by
+     *     subclasses.
+     * 
+     * Parameters:
+     * context - {Object} Context to use in evaluating the filter.  If a vector
+     *     feature is provided, the feature.attributes will be used as context.
+     * 
+     * Returns:
+     * {Boolean} The filter applies.
+     */
+    evaluate: function(context) {
+        return true;
+    },
+    
+    /**
+     * APIMethod: clone
+     * Clones this filter. Should be implementted by subclasses.
+     * 
+     * Returns:
+     * {<OpenLayers.Filter>} Clone of this filter.
+     */
+    clone: function() {
+        return null;
+    },
+    
+    CLASS_NAME: "OpenLayers.Filter"
+});
+