Add setUrl function for GML layer. Thanks to a well done patch (with tests!)

from Ian Johnson. (Closes #1264)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@5776 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/GML.js

@@ -97,7 +97,21 @@ OpenLayers.Layer.GML = OpenLayers.Class(OpenLayers.Layer.Vector, {
             this.loaded = true;
         }    
     },    
-        
+    
+    /**
+     * Method: setUrl
+     * Change the URL and reload the GML
+     *
+     * Parameters:
+     * url - {String} URL of a GML file.
+     */
+    setUrl:function(url) {
+        this.url = url;
+        this.destroyFeatures();
+        this.loaded = false;
+        this.events.triggerEvent("loadstart");
+        this.loadGML();
+    },
     
     /**
      * Method: requestSuccess