another XML format using XSLT. The output XML file has a schema and
has a required 'seq' attribute in the root element that needs to be
incremented for each input XML file.
...
for every input file, in the transformation, I want to increment
attribute 'seq' in the output file by 1 when I transform the input
files using xslt.
I have tried <xsl:number> and tried writing a function. But the
problem is that since variables in xslt are constants, there is no way
to increment a number, store it in a temp variable and increment it
for the next time in xslt 2.0 unlike procedural languages like C or
C++.
Is there any other way of achieving this in XSLT 2.0?
Using position() is one option, keeping track of the number of
documents you are processing yourself, using a recursive template,
is another:
<?xml version="1.0" encoding="UTF-8"?>
<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">
<!-- URI approporiate for fn:collection, e.g., in
saxon:
<collection stable="true">
<doc href="file1.xml" />
<doc href="file2.xml" />
<doc href="file3.xml" />
</collection>
-->
<xsl:param name="collection-href" required="yes" />
<!-- Previous sequence number, if we need to start at
some point other than 1. -->
<xsl:param name="previous-number" select="0" />
<xsl:template match="/">
<xsl:call-template name="example">
<xsl:with-param name="documents" select="collection($collection-href)" />
<xsl:with-param name="previous-number" select="$previous-number" />
</xsl:call-template>
</xsl:template>
<xsl:template name="example">
<xsl:param name="documents" />
<xsl:param name="previous-number" required="yes" />
<xsl:if test="$documents[1]">
<xsl:variable name="current-number" as="xs:integer"
select="xs:integer($previous-number+1)" />
<!-- Here we could use xsl:result-document and xsl:apply-templates
to kick off processing of our input document. -->
<example seq="{$current-number}" />
<!-- Now we recursively process the next document in our list -->
<xsl:call-template name="example">
<xsl:with-param name="documents" select="remove($documents, 1)" />
<xsl:with-param name="previous-number" select="$current-number" />
</xsl:call-template>
</xsl:if>
<!-- Here, if not($documents), we could write out our
last number to some file that we use to track our
sequence number across time. -->
</xsl:template>
</xsl:stylesheet>
Running this w/ the example collection document and no override
of $previous-number would produce
<example seq="1"/>
<example seq="2"/>
<example seq="3"/>
whereas setting $previous-number to 3 would produce
<example seq="4"/>
<example seq="5"/>
<example seq="6"/>
Jim
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
James A. Robinson
jim(_dot_)robinson(_at_)stanford(_dot_)edu
Stanford University HighWire Press http://highwire.stanford.edu/
+1 650 7237294 (Work) +1 650 7259335 (Fax)
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