dom w3c dom DocumentFragment w3c dom Node w3c dom Text documentfragmentimpl parentnode documentfragment serialversionuid l documentfragmentimpl coredocumentimpl ownerdoc ownerdoc documentfragmentimpl getnodetype node.document_fragment_node getnodename normalize isnormalized needssyncchildren synchronizechildren childnode kid kid firstchild kid kid kid.nextsibling kid.getnodetype node.text_node next.getnodetype node.text_node text kid appenddata next.getnodevalue removechild kid kid.getnodevalue kid.getnodevalue length removechild kid kid.normalize isnormalized