List children = (List) tree.getChildren( );
List children = tree.getChildren( );
	protected void writeContentTree( ContentTree tree )	{		if ( tree == null || tree.isEmpty( ) )			return;		List children = (List) tree.getChildren( );		for ( int i = 0; i < children.size( ); i++ )		{			ContentNode node = (ContentNode) children.get( i );			writeContentNode( node );		}	}