1SAX.setDocumentLocator()
2SAX.startDocument()
3SAX.internalSubset(doc, , )
4SAX.elementDecl(doc, 3, ...)
5SAX.attributeDecl(doc, val, 1, 3, NULL, ...)
6SAX.externalSubset(doc, , )
7SAX.startElement(doc, val='v1')
8SAX.endElement(doc)
9SAX.endDocument()
10