SAX.setDocumentLocator()
SAX.startDocument()
SAX.startElement(root)
SAX.characters(
  , 3)
SAX.startElement(foo, xmlns='http://abc')
SAX.endElement(foo)
SAX.characters(
  , 3)
SAX.startElement(bar)
SAX.endElement(bar)
SAX.characters(
, 1)
SAX.endElement(root)
SAX.endDocument()