Pass key from one XSL to another

Hi,

  I recently had a need to pass key from one XSL to
another.  The way my XSLs are organized is that all
common templates are kept in _base.xsl, while XSL such
as Organization.xsl import the _base.xsl.
  The functionality I need to implement now is to
apply transformation from Excel date to all Extended
Attributes (XA) that has data type of "date".
  Within Organization.xsl, I keep XAs of date type in
a key, and would like to pass this key to the template
that processes XAs which is located in _base.xsl so
that I can use key() to find if a XA is of date type
or not.
  Can this be done?  If not, I suppose my fallback is
to set all XAs of date type as a node-set in a
variable, which pass onto XA template, then use
xsl:for-each within the template.
  Any comments and suggestions welcomed.

Much appreciated,
Xiaocun

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