Do we have alternative of resetDocument in Libxml2?

Hi , I am using
parserCtx = xmlCreatePushParserCtxt(&saxNhandler, parser, NULL, 0, NULL);
int parseStatus = xmlParseChunk(parserCtx, xml, strlen(xml),0);

But I am unable to process next request ,able to process 1st request .It seems like we are unable to reset before processing new request

Earlier in my code we were using
saxParser.resetDocument(); —> In xerces
can anyone help me in this ?