question: private boolean addNodesInDocOrder ( int start , int end , int testIndex , NodeList nodelist , XPathContext support ) { if ( ! m_mutable ) throw new RuntimeException ( XSLMessages . createXPATHMessage ( XPATHErrorResources . ER_NODESET_NOT_MUTABLE , null ) ) ; boolean foundit = false ; int i ; Node node = nodelist . item ( testIndex ) ; for ( i = end ; i >= start ; i -- ) { Node child = ( Node ) elementAt ( i ) ; if ( child == node ) { i = - 2 ; break ; } if ( ! DOM2Helper . isNodeAfter ( node , child ) ) { insertElementAt ( node , i + 1 ) ; testIndex -- ; if ( testIndex > 0 ) { boolean foundPrev = addNodesInDocOrder ( 0 , i , testIndex , nodelist , support ) ; if ( ! foundPrev ) { addNodesInDocOrder ( i , size ( ) - 1 , testIndex , nodelist , support ) ; } } break ; } } if ( i == - 1 ) { insertElementAt ( node , 0 ) ; } return foundit ; }
target:  Add the node list to this node set in document order.