<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes"/>
<xsl:template match="@* | node()">
<xsl:copy>
<xsl:apply-templates select="@*"/>
<xsl:apply-templates select="node()[1]"/>
</xsl:copy>
<xsl:apply-templates select="following-sibling::node()[1]"/>
</xsl:template>
</xsl:stylesheet>
This transformation produces the same results as the more well-known
identity rule.
The difference is that we now have the finest possible grain-level of
controll as every xsl:apply-templates instruction above always selects
at
most one node.
It is trivial to add parameters and to override the one-at-a-time
identity
for elements. Thus we finally have:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes"/>
<xsl:template match="@* | node()">
<xsl:param name="pnAncestors" select="0"/>
<xsl:param name="pnPreceding" select="0"/>
<xsl:copy>
<xsl:apply-templates select="@*"/>
<xsl:apply-templates select="node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors+1"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding"/>
</xsl:apply-templates>
</xsl:copy>
<xsl:apply-templates select="following-sibling::node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding+1"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="*">
<xsl:param name="pnAncestors" select="0"/>
<xsl:param name="pnPreceding" select="0"/>
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:attribute name="_id">
<xsl:value-of select=
"concat(name(), '_',
$pnAncestors, '_',
$pnPreceding
)"/>
</xsl:attribute>
</xsl:copy>
<xsl:apply-templates select="node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors+1"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding"/>
</xsl:apply-templates>
<xsl:apply-templates select="following-sibling::node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding+1"/>
</xsl:apply-templates>
</xsl:template>
</xsl:stylesheet>
Ooppss...
The last but one xsl:apply-templates must be inside xsl:copy.
So, the correct override for elements is:
<xsl:template match="*">
<xsl:param name="pnAncestors" select="0"/>
<xsl:param name="pnPreceding" select="0"/>
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:attribute name="_id">
<xsl:value-of select=
"concat(name(), '_',
$pnAncestors, '_',
$pnPreceding
)"/>
</xsl:attribute>
<xsl:apply-templates select="node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors+1"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding"/>
</xsl:apply-templates>
</xsl:copy>
<xsl:apply-templates select="following-sibling::node()[1]">
<xsl:with-param name="pnAncestors"
select="$pnAncestors"/>
<xsl:with-param name="pnPreceding"
select="$pnPreceding+1"/>
</xsl:apply-templates>
</xsl:template>
Cheers,
Dimitre Novatchev
FXSL developer,
http://fxsl.sourceforge.net/ -- the home of FXSL
Resume: http://fxsl.sf.net/DNovatchev/Resume/Res.html
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