thanks Michael Kay, i have appreciated your very important valued. i use XSL
for my work, i 've studied XML with books of Scott Means e Rusty Harold and XSL
with that one of van Otegem, but i don't understand what you wrote. Where can i
find something about Xpath expression? in the site of W3C, for example, i cant'
find what does ^ mean and f:index-of-node too. Can you explane me? Thank you a
lot.
<xsl:template match="mets:div/@LABEL[matches(., '^Pagina [0-9]+$')]">
<xsl:variable name="n">
<xsl:number level="any" count="mets:div[(_at_)LABEL[matches(.,
'^Pagina
[0-9]+$')]]"/>
</xsl:variable>
<xsl:attribute name="LABEL" select="concat('Carta ',
if ($n mod 2 = 0) then concat(($n + 1) idiv 2, 'v') else
concat(($n + 1) idiv 2, 'r'))"/>
</xsl:template>
The redundancy of repeating the whole pattern is pretty horrible, both for
performance and for maintenance.
An idiom I have used in such cases is:
<xsl:variable name="g" select="//mets:div[matches(@LABEL, '^Pagina
[0-9]+$')]"/>
<xsl:template match="*[. intersect $g]/@LABEL">
<xsl:variable name="n" select="f:index-of-node($g, .)"/>
where
<xsl:function name="f:index-of-node" as="xs:integer*">
<xsl:param name="nodes" as="node()*"/>
<xsl:param name="node" as="node()"/>
<xsl:for-each select="$nodes">
<xsl:sequence select="position()[current() is $node]"/>
</xsl:for-each>
</xsl:function>
which still isn't ideal, but it feels a bit better.
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
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