protected function createTreeNodeDOMElement( DOMDocument $domDocument, eZContentObjectTreeNode $node )
    {
        $nodeElement = $domDocument->createElement( 'Node' );

        // Set attributes.
        $nodeElement->setAttribute( 'nodeID', $node->attribute( 'node_id' ) );
        $nodeElement->setAttribute( 'parentID', $node->attribute( 'parent_node_id' ) );

        // Get child information.
        $conditions = array( 'Depth' => 1,
                             'DepthOperator' => 'eq' );
        $nodeElement->setAttribute( 'childCount', eZContentObjectTreeNode::subTreeCountByNodeID( $conditions, $node->attribute( 'node_id' ) ) );

        // Get child information for tree structure.
        $conditions['ClassFilterType'] = 'include';
        $conditions['ClassFilterArray'] = eZINI::instance( 'contentstructuremenu.ini' )->variable( 'TreeMenu', 'ShowClasses' );
        $nodeElement->setAttribute( 'childMenuCount', eZContentObjectTreeNode::subTreeCountByNodeID( $conditions, $node->attribute( 'node_id' ) ) );

        // Get access rights element.
        $nodeElement->appendChild( $this->createAccessDOMElement( $domDocument, $node ) );

        // Get object element.
        $nodeElement->appendChild( $this->createObjectDOMElement( $domDocument, $node->attribute( 'object' ) ) );

        return $nodeElement;
    }