Update comment/documentation

lib/OpenLayers/Format/XML/VersionedOGC.js

@@ -13,6 +13,17 @@
  * Base class for versioned formats, i.e. a format which supports multiple
  * versions.
  *
+ * To enable checking if parsing succeeded, you will need to define a property
+ * called errorProperty on the parser you want to check. The parser will then
+ * check the returned object to see if that property is present. If it is, it
+ * assumes the parsing was successful. If it is not present (or is null), it will
+ * pass the document through an OGCExceptionReport parser.
+ * 
+ * If errorProperty is undefined for the parser, this error checking mechanism
+ * will be disabled.
+ *
+ *
+ * 
  * Inherits from:
  *  - <OpenLayers.Format.XML>
  */
@@ -45,15 +56,6 @@ OpenLayers.Format.XML.VersionedOGC = OpenLayers.Class(OpenLayers.Format.XML, {
      */
     allowFallback: false,
 
-    /**
-     * APIProperty: errorProperty
-     * {String} Which property of the returned object to check for in order to
-     * determine whether or not parsing has failed. In the case that the
-     * errorProperty is undefined on the returned object, the document will be
-     * run through an OGCExceptionReport parser.
-     */
-    errorProperty: null,
-
     /**
      * Property: name
      * {String} The name of this parser, this is the part of the CLASS_NAME