Generate key with further restriction

Hi,
How can I generate keys with certain restrictions?
Would something like that
<xsl:key name="usedTypes" match="@*[name() = 'type' and 
not(starts-with(name(),'xs:'))]" use="." />
work to select those attributes with the name type that do not start 
with xs: ?
Do I need to take care of namespaces? How?
Regards
Tim


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