code: function() {
          var options = OpenLayers.Util.applyDefaults({
              value: this.value && this.value.clone && this.value.clone()
          }, this);
          return new OpenLayers.Filter.Spatial(options);
      }
docs: APIMethod: clone
  Clones this filter.
  
  Returns:
  {<OpenLayers.Filter.Spatial>} Clone of this filter.