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