How to dump a key for debuging purposes?

I am using some pretty complicated keys where I am using
concat to build up the use attribute:

 <xsl:key name="MyKey" match="//a/b/c" 
    use="concat(d,':',e,':',f)" />

Is there a general purpose template I could call that would dump
the associations I am defining? It is hard to debug the XSLT not
knowing if the key is constructed wrong or if there is a problem
in the processing logic. Thanks in advance.

Regards,

Dan

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