>>> parser.setContentHandler(ShowEvents())
>>> parser.parseString("AC   P97430; O09081; O09082;")

startDocument
startElement 'AC' {}
characters 'AC   '
startElement 'ac_number' {}
characters 'P97430'
endElement 'ac_number'
characters '; '
startElement 'ac_number' {}
characters 'O09081'
endElement 'ac_number'
characters '; '
startElement 'ac_number' {}
characters 'O09082'
endElement 'ac_number'
characters ';'
endElement 'AC'
endDocument