Fix for WMC does not read/write metadataURLs.

This matches the style of other similar properties in the code, and has a
negligable (<5%) impact on parsing speed in Firefox/Safari. patch from
bartvde, (Closes #1452) 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@7626 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/WMC/v1.js

@@ -375,6 +375,19 @@ OpenLayers.Format.WMC.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
         }
     },
 
+    /**
+     * Method: read_wmc_MetadataURL
+     */
+    read_wmc_MetadataURL: function(layerInfo, node) {
+        var metadataURL = {};
+        var links = node.getElementsByTagName("OnlineResource");
+        if(links.length > 0) {
+            this.read_wmc_OnlineResource(metadataURL, links[0]);
+        }
+        layerInfo.options.metadataURL = metadataURL.href;
+
+    },
+
     /**
      * Method: read_wmc_Abstract
      */
@@ -620,6 +633,11 @@ OpenLayers.Format.WMC.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
         node.appendChild(this.createElementDefaultNS(
             "Title", layer.name
         ));
+
+        // optional MetadataURL element
+        if (layer.metadataURL) {
+            node.appendChild(this.write_wmc_MetadataURL(layer));
+        }
         
         // optional FormatList element
         node.appendChild(this.write_wmc_FormatList(layer));
@@ -726,6 +744,25 @@ OpenLayers.Format.WMC.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
         return node;
     },
 
+    /**
+     * Method: write_wmc_MetadataURL
+     * Create a MetadataURL node given a layer object.
+     *
+     * Parameters:
+     * layer - {<OpenLayers.Layer.WMS>} Layer object.
+     *
+     * Returns:
+     * {Element} A WMC metadataURL element node.
+     */
+    write_wmc_MetadataURL: function(layer) {
+        var node = this.createElementDefaultNS("MetadataURL");
+
+        // required OnlineResource element
+        node.appendChild(this.write_wmc_OnlineResource(layer.metadataURL));
+
+        return node;
+    },
+
     /**
      * Method: write_wmc_FormatList
      * Create a FormatList node given a layer.