registering entities with sax parser

[Ralf Schmitt]

Hi,
is there a way to register entity definitions with a sax parser?
I want the following program to work without specifying an DTD in the
xml document.

from xml.sax import handler, make_parser

class Parser(handler.ContentHandler):
def startElement(self, name, attrs):
print name, attrs['foobar']

doc = '''<?xml version="1.0"?>
<note bla="&auml;"></to>
</note> '''

make_parser().feed(doc).close()

Thanks for any help,
- Ralf