jaxp validation xml stream XMLStreamException xml stream XMLStreamReader xml stream events Characters xml stream events Comment xml stream events xml stream events EndDocument xml stream events xml stream events ProcessingInstruction xml stream events StartDocument xml transform stax StAXResult xni XMLDocumentHandler staxdocumenthandler xmldocumenthandler setstaxresult staxresult startdocument xmlstreamreader reader xmlstreamexception xmlstreamreader reader xmlstreamexception comment xmlstreamreader reader xmlstreamexception processinginstruction xmlstreamreader reader xmlstreamexception entityreference xmlstreamreader reader xmlstreamexception startdocument startdocument event xmlstreamexception enddocument event xmlstreamexception doctypedecl event xmlstreamexception characters characters event xmlstreamexception cdata characters event xmlstreamexception comment comment event xmlstreamexception processinginstruction processinginstruction event xmlstreamexception entityreference event xmlstreamexception setignoringcharacters ignore