question: public void addNodes ( DTMIterator iterator ) { if ( ! m_mutable ) throw new RuntimeException ( XSLMessages . createXPATHMessage ( XPATHErrorResources . ER_NODESETDTM_NOT_MUTABLE , null ) ) ; if ( null != iterator ) { int obj ; while ( DTM . NULL != ( obj = iterator . nextNode ( ) ) ) { addElement ( obj ) ; } } }
target:  Copy NodeList members into this nodelist, adding in document order.  Null references are not added.