question: public void addNodesInDocOrder ( NodeList nodelist , XPathContext support ) { if ( ! m_mutable ) throw new RuntimeException ( XSLMessages . createXPATHMessage ( XPATHErrorResources . ER_NODESET_NOT_MUTABLE , null ) ) ; int nChildren = nodelist . getLength ( ) ; for ( int i = 0 ; i < nChildren ; i ++ ) { Node node = nodelist . item ( i ) ; if ( null != node ) { addNodeInDocOrder ( node , support ) ; } } }
target:  Copy NodeList members into this nodelist, adding in document order.  If a node is null, don't add it.