<xsl:variable name="l" select="'abcdefghijklmnopqrstuvwxyz'"/>
<xsl:variable name="u" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/>

select="translate(.,$l,$u)"

Unfortunately that's an English answer.

If you are using a language other than english the lists get longer.

If you are using german and want an ess-zed (&#223;) to uppercase to SS then even more
unfortunately you have to work a lot harder.

David

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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list