public function toXmlNoWrap()
 {
     if ($this->isComplex()) {
         $str = "";
         foreach ($this->filterArray as $filter) {
             $str .= $filter->toXmlNoWrap();
         }
         $op = $this->mapOperator($this->booleanOperator);
         return "<" . $op["open"] . ">" . $str . "</" . $op["close"] . ">";
     } else {
         $k = "<ogc:PropertyName>" . $this->key . "</ogc:PropertyName>";
         if (in_array($this->operator, explode(",", self::SPATIAL_OPERATORS))) {
             $gmlFactory = new UniversalGmlFactory();
             $gml = $gmlFactory->createFromGeoJson($this->value, $this->wfsConf);
             $v = $gml->toGml();
         } else {
             $v = "<ogc:Literal>" . $this->value . "</ogc:Literal>";
         }
         $op = $this->mapOperator($this->operator);
         return "<" . $op["open"] . ">" . $k . $v . "</" . $op["close"] . ">";
     }
 }
 /**
  * Shortcut for GeoJSON conversion
  * 
  * @return String
  * @param $geoJson String
  */
 public static function geoJsonToGml($geoJson)
 {
     $gmlFactory = new UniversalGmlFactory();
     $myGmlObj = $gmlFactory->createFromGeoJson($geoJson);
     return $myGmlObj->toGml();
 }