code: function(options) {
          if(window.ActiveXObject) {
              this.xmldom = new ActiveXObject("Microsoft.XMLDOM");
          }
          OpenLayers.Format.prototype.initialize.apply(this, [options]);
          // clone the namespace object and set all namespace aliases
          this.namespaces = OpenLayers.Util.extend({}, this.namespaces);
          this.namespaceAlias = {};
          for(var alias in this.namespaces) {
              this.namespaceAlias[this.namespaces[alias]] = alias;
          }
      }
docs: Constructor: OpenLayers.Format.XML
  Construct an XML parser.  The parser is used to read and write XML.
  Reading XML from a string returns a DOM element.  Writing XML from
  a DOM element returns a string.
  
  Parameters:
  options - {Object} Optional object whose properties will be set on
  the object.