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