accessing the XML attribute value noNamespaceSchemaLocation thru Python 2.5

[tooshiny]

I am currently successfully using lxml and ElementTree to validate and
to access the XML contained data. I can however not find any
functional call to access the schema location ie the attribute value
noNamespaceSchemaLocation.

A simple function call would be so much nicer than the other route of
file reading / string chopping etc

Can anybody help

Many thanks