Pullup changes for RC3:

* KML Examples broken (Closes #1001)
 * drag handler doesn't reset properties on left or improperly modified mousedown (Closes #1003)
 * Text nodes limited to 4096 in length (Closes #1006)
 * KML/GML Attribute CDATA Parsing (Closes #1007)
 * Control.MousePosition (Closes #1008)


git-svn-id: http://svn.openlayers.org/branches/openlayers/2.5@4432 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/XML.js

@@ -256,6 +256,62 @@ OpenLayers.Format.XML = OpenLayers.Class(OpenLayers.Format, {
         }
         return attributeValue;
     },
+    
+    /**
+     * APIMethod: getChildValue
+     * Get the value of the first child node if it exists, or return an
+     *     optional default string.  Returns an empty string if no first child
+     *     exists and no default value is supplied.
+     *
+     * Parameters:
+     * node - {DOMElement} The element used to look for a first child value.
+     * def - {String} Optional string to return in the event that no
+     *     first child value exists.
+     *
+     * Returns:
+     * {String} The value of the first child of the given node.
+     */
+    getChildValue: function(node, def) {
+        var value;
+        try {
+            value = node.firstChild.nodeValue;
+        } catch(e) {
+            value = (def != undefined) ? def : "";
+        }
+        return value;
+    },
+
+    /**
+     * APIMethod: concatChildValues
+     * Concatenate the value of all child nodes if any exist, or return an
+     *     optional default string.  Returns an empty string if no children
+     *     exist and no default value is supplied.  Not optimized for large
+     *     numbers of child nodes.
+     *
+     * Parameters:
+     * node - {DOMElement} The element used to look for child values.
+     * def - {String} Optional string to return in the event that no
+     *     child exist.
+     *
+     * Returns:
+     * {String} The concatenated value of all child nodes of the given node.
+     */
+    concatChildValues: function(node, def) {
+        var value = "";
+        var child = node.firstChild;
+        var childValue;
+        while(child) {
+            childValue = child.nodeValue;
+            if(childValue) {
+                value += childValue;
+            }
+            child = child.nextSibling;
+        }
+        if(value == "" && def != undefined) {
+            value = def;
+        }
+        return value;
+    },
 
     /**
      * APIMethod: hasAttributeNS