Re: [xsl] XPath problem with getting all ancestors

[Jostein Austvik Jacobsen <josteinaj@xxxxxxxxx>]

Ok, I've stripped it down a fair bit. When I run this:


<?xml version="1.0" encoding="utf-8"?>
<document>
       <article>
               <meta>
                       <title>Title</title>
               </meta>
               <content>
                       <para>
                               <note id="1">text</note>
                       </para>
               </content>
       </article>
</document>


through this:


<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0" xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:mf="http://example.com/2009/mf"; exclude-result-prefixes="xs mf">

	<xsl:template match="document">
		<document>
			<meta/>
			<content>
				<xsl:for-each select="article">
					<xsl:sort select="(.//@page)[1]"/>
					<xsl:apply-templates select="article"/>
				</xsl:for-each>
				<xsl:apply-templates/>
			</content>
		</document>
	</xsl:template>

	<xsl:template match="article">
		<xsl:variable name="v1">
			<xsl:copy-of select="content/node()"/>
		</xsl:variable>
		<xsl:sequence select="mf:group($v1/node())"/>
	</xsl:template>
	<xsl:function name="mf:group" as="node()*">
		<xsl:param name="nodes" as="node()*"/>
		<xsl:for-each-group select="$nodes" group-starting-with="foo">
			<xsl:apply-templates/>
		</xsl:for-each-group>
	</xsl:function>

	<xsl:template match="note">
		The note at /article/content/para/note reads:
		ancestors="<xsl:value-of select="count(ancestor::*)"/>"
		preceding="<xsl:value-of select="count(preceding::*)"/>"
		contentNum="<xsl:value-of select="count(preceding::content)"/>"
		numberTest="<xsl:number level="any" count="content"/>"
	</xsl:template>

</xsl:stylesheet>


I get this:


<?xml version="1.0" encoding="UTF-8"?>
<document>
	<meta/>
	<content>
		The note at /article/content/para/note reads:
		ancestors="1"
		preceding="0"
		contentNum="0"
		numberTest=""
	</content>
</document>


In this case I would expect:
ancestors="3" (para,content,article)
preceding="2" (meta,title)

But I guess I'm applying the template in a wrong way?

Regards
Jostein

2009/10/23 Jostein Austvik Jacobsen <josteinaj@xxxxxxxxx>:
> David/Syd: I tried replacing the value-of with <xsl:number level="any"
> count="content"/>, but it returned nothing. I'm sure I'm using it
> wrong though so I'll have myself a read on xsl:number.
> Syd: Sorry about the misplaced match. I tried it myself now and
> actually got the same as you.
> Syd/Michael: I'll try to strip down my stylesheet to localize the
> problem further, then I'll post it back here.
>
> Thanks
> Jostein
>
> 2009/10/23 Michael Kay <mike@xxxxxxxxxxxx>:
>>
>> My guess (and it's a completely wild one) is that you aren't applying
>> templates to the note element in the source tree as you have shown it, but
>> to a copy of the note element in some smaller tree, probably a tree rooted
>> at the para element.
>>
>> To confirm that we would need to see more of the stylesheet. Or, within
the
>> match="note" template, do
>>
>> <xsl:message><xsl:copy-of select="/"/></xsl:message>
>>
>> to see what tree you are processing at the time.
>>
>> Regards,
>>
>> Michael Kay
>> http://www.saxonica.com/
>> http://twitter.com/michaelhkay
>>
>>> -----Original Message-----
>>> From: Jostein Austvik Jacobsen [mailto:josteinaj@xxxxxxxxx]
>>> Sent: 23 October 2009 11:27
>>> To: xsl-list
>>> Subject: [xsl] XPath problem with getting all ancestors
>>>
>>> I've got a document like this:
>>>
>>> <?xml version="1.0" encoding="utf-8"?>
>>> <document>
>>>       <article>
>>>               <meta>
>>>                       <title>Title</title>
>>>               </meta>
>>>               <content>
>>>                       <headline>Headline</headline>
>>>                       <para>
>>>                               <note id="1">text</note>
>>>                       </para>
>>>               </content>
>>>       </article>
>>> </document>
>>>
>>> And in a template for the note tags I'm trying to use the
>>> ancestor axis to get the list [ para , content , article ].
>>> However, I only seem to get [ para ] with ancestor::* and [ para , ""
>>> ] with ancestor::node().
>>> When I test it like this:
>>>
>>> <xsl:template match="note">
>>>               ancestors="<xsl:value-of select="count(ancestor::*)"/>"
>>>               preceding="<xsl:value-of select="count(preceding::*)"/>"
>>>               contentNum="<xsl:value-of
>>> select="count(preceding::content)"/>"
>>> </xsl:template match>
>>>
>>> ...I get ancestors="1", preceding="2" and contentNum="0" as output.
>>>
>>> What I actually need to do is to count the number of content
>>> nodes preceding the current note (relevant for the input XML
>>> note numbering scheme). I did so earlier in the document (for
>>> referencing the actual
>>> notes) when matching document like this:
>>>
>>> <xsl:template match="document">
>>>       (...)
>>>       <xsl:for-each select="//note">
>>>               <note>
>>>                       <xsl:attribute name="id"><xsl:value-of
>>> select="count(ancestor::content/preceding::content)"/></xsl:attribute>
>>>                       <p><xsl:apply-templates/></p>
>>>               </note>
>>>       </xsl:for-each>
>>>       (...)
>>> </xsl:template>
>>>
>>> So here I get access to all of the notes ancestors. In
>>> retrospect I could probably have used
>>> select="count(preceding::content)" instead, but still...
>>>
>>> How come that I cannot access the notes ancestors from my
>>> note template?
>>>
>>> Regards
>>> Jostein