namespaces

While in the middle of processing a XSLT tempalte, I
have a declared namespace URI, but I do not have the
shorthand.  Is there anyway to get the shorthand back
and stick it into a variable?

The reason I need to do this is to stick it in the
text of an attribute

<x y="unknown:i.execute()" />

where unknown is the unknown shorthand, but we have
the URI http://www.known.com


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