Add support for ArcIMS/ArcXML to OpenLayers.

Thanks for the killer effort from David Zwarg from Avencia in building this, 
and for Tim Schaub from OpenGeo for his excellent review. r=me,tschaub
(Closes #213)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@9249 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/ArcXML/Features.js

@@ -0,0 +1,48 @@
+/* Copyright (c) 2009 MetaCarta, Inc., published under the Clear BSD
+ * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Format/ArcXML.js
+ */
+
+/**
+ * Class: OpenLayers.Format.ArcXML.Features
+ * Read/Wite ArcXML features. Create a new instance with the 
+ *     <OpenLayers.Format.ArcXML.Features> constructor.
+ * 
+ * Inherits from:
+ *  - <OpenLayers.Format.XML>
+ */
+OpenLayers.Format.ArcXML.Features = OpenLayers.Class(OpenLayers.Format.XML, {
+
+    /**
+     * Constructor: OpenLayers.Format.ArcXML.Features
+     * Create a new parser/writer for ArcXML Features.  Create an instance of this class
+     * to get a set of features from an ArcXML response.
+     *
+     * Parameters:
+     * options - {Object} An optional object whose properties will be set on
+     *     this instance.
+     */
+    initialize: function(options) {     
+        OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
+    },
+    
+    /**
+     * APIMethod: read
+     * Read data from a string of ArcXML, and return a set of OpenLayers features. 
+     * 
+     * Parameters:
+     * data - {String} or {DOMElement} data to read/parse.
+     *
+     * Returns:
+     * {Array(<OpenLayers.Feature.Vector>)} A collection of features.
+     */
+    read: function(data) {
+        var axl = new OpenLayers.Format.ArcXML();
+        var parsed = axl.read(data);
+        
+        return parsed.features.feature;
+    }
+});