using keys as cross-reference

Hi,

  I am interested to implement cross-reference using
keys  (suggested by Jeni as well as documented in the
XSLT Programmer Reference 2nd Ed. on p.501-3).
  My situation is I have more readable headers in
Excel (i.e. *Organization Unique ID)that needs to be
translated into DTD attribute names (i.e.
OrganizationCode).  I intend to put the name-value
mapping in a separate XML, which I want to use keys to
retrieve the translation.
  I see two ways to accomplish this:
1. translates all the headers at the beginning of the
stylesheet into global variables.  This way, I do not
have to write user defined extensions.  The drawback
to this I lose extensibility, it will be difficult
when I also wish to translate values other than the
headers.
2. user defined extension to translate between name
and value on demand.
Are there other more effective solutions?
  Regarding solution #2 user defined extension, how to
pass the key into the extension since <xsl:key> has to
be top-level element?  With example on XSLT Programmer
Reference 2nd Ed. on p.502,
<xsl:key name="biog" match="author" use="@name"/>
In my extension function, can I directly use:
key('biog', $name)?

Much thanks,
Xiaocun

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