My non-xsl mind wants to use a mutable variable:
You should worry, your mind has been corrupted by exposure to
unnatural imperative programming languages:-)
If you were describing the problem to a human, you would not start
with "initialize a variable $current_region"
The XSLT version far more closely follows your english description
we would like to show the first region name only to avoid repetition.
<xsl:for-each-group select="row" group-by select="region">
<xsl:value-of select="current-grouping-key()"/>
<xsl:for-each select="current-group()">
do something with all the rows with this <region>US</region> or whatever
</xsl:for-each>
</xsl:for-each-group>
assuming an input like
<row><region>US</region>...</row>
<row><region>US</region>...</row>
<row><region>Europe</region>...</row>
So not only do you not need mutable variables, you don't need a variable at all.
David
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