SAX.setDocumentLocator()
SAX.startDocument()
SAX.internalSubset(doc, (null), (null))
SAX.elementDecl(doc, 3, ...)
SAX.elementDecl(a, 3, ...)
SAX.elementDecl(b, 3, ...)
SAX.startElement(doc)
SAX.startElement(a)
SAX.characters(This</a> is a <b>valid</b> doc, 4)
SAX.endElement(a)
SAX.characters( is a <b>valid</b> document</d, 6)
SAX.startElement(b)
SAX.characters(valid</b> document</doc>
, 5)
SAX.endElement(b)
SAX.characters( document</doc>
, 9)
SAX.endElement(doc)
SAX.endDocument()