[xsl] Case incensitive key

Hello,

Is case insensitive keys possible in XSLT 1.0?  It isn't the end of the
world, as I can simply abandon the key but would rather not.

For sake of discussion, here's my use of a key:

<xsl:key name="key_goty-email" match="row" use="Description/email"/>

<xsl:if test="count(key('key_goty-email',current()/email)) &gt; 1">
....
</xsl:if>

So the current node, Description/email could have something like:
Myemail(_at_)Email(_dot_)com
Other potentional key matching nodes could be: myemail(_at_)email(_dot_)com or
MYEMAIL(_at_)EMAIL(_dot_)COM

Thanks,

Karl..
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