Not sure I understand the requirements completely, but given your
input, the following does produce the desired output.
---------
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema"; exclude-result-prefixes="xs"
version="2.0">
<!-- standard easy-to-write identity template -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<!-- process a heading that has an @id specially: -->
<xsl:template match="Heading[@id]">
<xsl:copy>
<!-- first, process my attributes -->
<xsl:apply-templates select="@*"/>
<!-- then, copy over desired <ToRef> -->
<xsl:apply-templates
select="../../Item/Heading[ not(@id) and @entry = current()/@entry
and @data eq current()/@data ]/ToRef"/>
<!-- last, process my children -->
<xsl:apply-templates select="node()"/>
</xsl:copy>
</xsl:template>
<!-- ignore <Item>s that have <Heading>s from which we already took the
<ToRef> -->
<!-- (Note that this code does not check to see that we actually took or will
-->
<!-- take the <ToRef> ? rather it just tests if there is no id= attr, and
figures -->
<!-- that if there is not an id=, then the entry= and data= must have
matched. -->
<xsl:template match="Item[Heading[not(@id)]]"/>
</xsl:stylesheet>
---------
I need to find <Items> in a <List> that have an identical <Heading>
attributes except for the @id, and insert a <ToRefs> element from
the <Item> without an @id into the <Item> that has the @id
attribute. Sample input and output <Item>s are shown below.
I will need to do the same sort of insertion at the <SubDiv1>
level, or at the two other possible nested levels of <SubDiv2> and
<SubDiv3> [not shown].
I will try to figure out how to do those latter cases once I
understand how to do the <Headings> case.
Any help appreciated,
Input:
<List>
<Item>
<Heading id="A4" entry="subject" data="Abolition of Serfdom">
<SubDiv1 id="A4-1" catalog="1" scott-number="350" pofis-number="474"
data="1948. 100th Anniversary of Abolition">
<Article>
<Person>Bulletin of the Ministry of Posts</Person>
<Title>New issues [Title varies or absent]</Title>
</Article>
</SubDiv1>
</Heading>
</Item>
<Item>
<Heading entry="subject" data="Abolition of Serfdom">
<ToRef xref="See also" data="Slovakia - Peasant Revolt 1848" file="s"
block="A1272-21"/>
</Heading>
</Item>
</List>
Output:
<List>
<Item>
<Heading id="A4" entry="subject" data="Abolition of Serfdom">
<ToRef xref="See also" data="Slovakia - Peasant Revolt 1848" file="s"
block="A1272-21"/>
<SubDiv1 id="A4-1" catalog="1" scott-number="350" pofis-number="474"
data="1948. 100th Anniversary of Abolition">
<Article>
<Person>Bulletin of the Ministry of Posts</Person>
<Title>New issues [Title varies or absent]</Title>
</Article>
</SubDiv1>
</Heading>
</Item>
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