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Subject: [xsl] Extracting a fragment between milestones from a complex structure. From: Jeroen Hellingman <jeroen@xxxxxxxx> Date: Mon, 28 Feb 2011 23:00:10 +0100 |
I am looking for a template which allows me to extract a single page, as
marked by milestone elements <pb n="12"/> from a complex structure. Note
that the milestone elements may occur in different parents. I want all
the parent nodes, and everything between the <pb n="12"/> and the next
<pb/> element
For example, when applying the extract method with as parameter "12" on
the following sample
<TEI>
<front>...</front>
<body>
<div1>
<head>Blah</head>
Blah blah <pb n="12"/> blah blah.
</div1>
<div1>
Blah blah blah blah.
</div1>
<div1>
Blah <hi>blah <pb n="13"/> blah</hi> blah.
</div1>
</body>
<back>...</back>
</TEI>
It should return:
<TEI>
<body>
<div1>
<pb n="12"/> blah blah.
</div1>
<div1>
Blah blah blah blah.
</div1>
<div1>
Blah <hi>blah <pb n="13"/></hi>
</div1>
</body>
</TEI>
The idea is that it will copy only elements that are a ancestor of
either <pb/> and follow the first <pb/> and precede the second <pb/>.
The problem I face is formulating a nice XPath to select those elements.
What I have so-far is a few templates that certainly do not behave as
expected:
<xsl:template name="extract-page">
<xsl:param name="n"/>
<xsl:call-template name="extract-from-to">
<xsl:with-param name="from" select="//pb[@n=$n]"/>
<xsl:with-param name="to"
select="(//pb[preceding::pb[@n=$n]])[1]"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="extract-from-to">
<xsl:param name="from"/>
<xsl:param name="to"/>
<xsl:copy-of select="$from"/>
<xsl:copy-of select="$to"/>
<xsl:apply-templates mode="copy"
select="//*[(ancestor::node()=$from and
ancestor::node()=$to) or (following::node()=$from and
preceding::node()=$to)]">
</xsl:apply-templates>
</xsl:template>
<xsl:template mode="copy" match="text()|*">
<xsl:copy>
<xsl:apply-templates mode="copy"/>
</xsl:copy>
</xsl:template>
Any hints or suggestions will be appreciated.
Jeroen Hellingman
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