public function __construct($strName, $strPropertyName = null, $strType = null, QQNode $objParentNode = null) {
            $this->objParentNode = $objParentNode;
            $this->strName = $strName;
            $this->strAlias = $strName;
            if ($objParentNode) $objParentNode->objChildNodeArray[$strName] = $this;