Here's my attempt that uses a key and does it in one pass:
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
exclude-result-prefixes="xs">
<xsl:key name="point-by-set-id-and-x" match="point"
use="concat(parent::set/@id,'-',@x)"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="point">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:attribute name="y2">
<xsl:value-of select="sum(@y1|preceding-sibling::point[(_at_)x =
current()/@x]/@y1)"/>
</xsl:attribute>
<xsl:attribute name="y3">
<xsl:value-of select="sum((@y1,
preceding-sibling::point[(_at_)x =
current()/@x]/@y1)) + sum(for $x in 1 to xs:integer(parent::set/@id - 1)
return key('point-by-set-id-and-x',
concat($x, '-', current()/@x))/@y1)"/>
</xsl:attribute>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
It could be re-written in pure 1.0 if you replaced the "for $x in to
xs:integer(parent::set/@id - 1)" with a recursive named template... if
you could be bothered :)
cheers
andrew
--
http://andrewjwelch.com
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