1SAX.setDocumentLocator()
2SAX.startDocument()
3SAX.internalSubset(doc, , )
4SAX.elementDecl(doc, 4, ...)
5SAX.elementDecl(a, 3, ...)
6SAX.elementDecl(b, 3, ...)
7SAX.elementDecl(c, 3, ...)
8SAX.elementDecl(d, 3, ...)
9SAX.externalSubset(doc, , )
10SAX.startElement(doc)
11SAX.startElement(b)
12SAX.characters(This, 4)
13SAX.endElement(b)
14SAX.startElement(c)
15SAX.characters( is a valid document, 20)
16SAX.endElement(c)
17SAX.endElement(doc)
18SAX.endDocument()
19