code: function(options) {
          OpenLayers.Filter.prototype.initialize.apply(this, [options]);
          // since matchCase on PropertyIsLike is not schema compliant, we only
          // want to use this if explicitly asked for
          if (this.type === OpenLayers.Filter.Comparison.LIKE 
              && options.matchCase === undefined) {
                  this.matchCase = null;
          }
      }
docs: Constructor: OpenLayers.Filter.Comparison
  Creates a comparison rule.
  
  Parameters:
  options - {Object} An optional object with properties to set on the
  rule
  
  Returns:
  {<OpenLayers.Filter.Comparison>}