kernel/classes/ezcontentobjecttreenode.php
public function classIdentifier()
    {
        if ( $this->ClassIdentifier === null )
        {
            $object = $this->object();
            $this->ClassIdentifier = $object->contentClassIdentifier();
        }

        return $this->ClassIdentifier;
    }
public function classIdentifier()
    {
        if ( $this->ClassIdentifier === null )
        {
            $object = $this->object();
            $this->ClassIdentifier = $object->contentClassIdentifier();
        }

        return $this->ClassIdentifier;
    }
public function classIdentifier ( ) { if ( $ this -> ClassIdentifier === null ) { $ object = $ this -> object ( ) ; $ this -> ClassIdentifier = $ object -> contentClassIdentifier ( ) ; } return $ this -> ClassIdentifier ; }
Returns the node's class identifier

@return string|bool|string|null
Returns the node s class identifier