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Interpretation of preceding axis (preceding-sibling in particular)
- To: xsl-list at lists dot mulberrytech dot com
- Subject: [xsl] Interpretation of preceding axis (preceding-sibling in particular)
- From: John-Paul Sicotte <jps at messagingDirect dot com>
- Date: Fri, 03 Aug 2001 10:59:31 -0600
- Reply-To: xsl-list at lists dot mulberrytech dot com
Hi,
I have read several of the threads on the preceding axes and looked
at the FAQ but I am still not 100% sure what should be returned. I
have built a stylesheet and an input file to illustrate the issue. It
tests the actual node set returned as well as the position of those
nodes.
xslt file
==========
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version = "1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match = "/document" >
<xsl:apply-templates select="element[1]" mode = "siblings"/>
<xsl:apply-templates select="element[5]" mode = "siblings"/>
<xsl:apply-templates select="element[10]" mode = "siblings"/>
</xsl:template>
<xsl:template match = "element" mode = "siblings">
<xsl:call-template name = "siblings"/>
</xsl:template>
<xsl:template match = "element" mode = "position"><xsl:value-of select = "position()"/></xsl:template>
<xsl:template name = "siblings">
Context Node: <xsl:value-of select = "."/>
Preceeding Siblings: <xsl:apply-templates select="preceding-sibling::element"/>
Preceeding Position: <xsl:apply-templates select="preceding-sibling::element" mode = "position"/>
Following Siblings: <xsl:apply-templates select="following-sibling::element"/>
Following Position: <xsl:apply-templates select="following-sibling::element" mode = "position"/>
</xsl:template>
</xsl:stylesheet>
--------------------
xml file
<?xml version = "1.0" standalone = "yes" ?>
<document>
<element pos = "1">1</element>
<element pos = "2">2</element>
<element pos = "3">3</element>
<element pos = "4">4</element>
<element pos = "5">5</element>
<element pos = "6">6</element>
<element pos = "7">7</element>
<element pos = "8">8</element>
<element pos = "9">9</element>
<element pos = "10">0</element>
</document>
--------------------------------------
I got the following output from XT
Context Node: 1
Preceeding Siblings:
Preceeding Position:
Following Siblings: 234567890
Following Position: 123456789
Context Node: 5
Preceeding Siblings: 1234
Preceeding Position: 1234
Following Siblings: 67890
Following Position: 12345
Context Node: 0
Preceeding Siblings: 123456789
Preceeding Position: 123456789
Following Siblings:
Following Position:
This position values seem incorrect to me. I would have expected the
positions to be reversed (ie 4321 and 987654321). It seems clear to me
that the reverse axes are counted from the context node backwards. The
immediately previous node should be 1.
The actual node ordering appears to be correct. Regardless of the
axis the nodes are returned in document order, only the position
changes. Is this interpretation correct?
John-Paul
----------------------
John-Paul Sicotte
Software Composer
MessagingDirect
mailto:John-Paul.Sicotte@MessagingDirect.com
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