Namespaces and attributes..

A quick question.. I working on a modular xml parser for php.. not too 
complicated and mainly used in private projects.

The 'modules' are loaded based on their xml namespace.. I simply pass 
through what element should be parsed and its attributes..

Here's my question, Say I use a namespace.. referred to as 
"urn:mynamespace" and the prefix 'a'

Considering this element. Should I always prefix the attributes with the 
same prefix, or can I just skip that:

<a:element att1="hello" />

or

<a:element a:att1="hello" />

Evert

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