saxon:evaluate passes the context through unchanged to the path expression
being evaluated. So if your path expression is relative, you need to ensure
the context item is correctly set. Using for-each is one way of doing that.
Another is
select="$compare_file/saxon:evaluate($value_xpath)"
I think the way I would do it would be to use the expression
<xsl:variable name="path" select="'$p1/foo/bar/@version'"/>
and then
select="saxon:evaluate($value_xpath, $compare_file)"
The second argument to saxon:evaluate is bound to $p1, the third to $p2, and
so on.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Scott Lynch [mailto:slynch(_at_)nortel(_dot_)com]
Sent: 14 April 2007 03:58
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] saxon:evaluate and external documents
I managed to get the saxon:evaluate to work with the external
doc with the following:
<xsl:for-each select="$compare_file">
<xsl:value-of select="saxon:evaluate($value_xpath)" />
</xsl:for-each>
This retrieves the value from the compare_file, but seems a
bit of a hack to me.
Any cleaner solution possible?
thanks,
Scott
-----Original Message-----
From: Lynch, Scott (NCRTP:3798)
Sent: Friday, April 13, 2007 6:24 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] saxon:evaluate and external documents
All,
I'm having problems with saxon:evaluate (Saxon 8.8) when
using a document reference. In a nutshell, I want to display
the data in the document being transformed along side the
same type of data from an external document. Both documents
use the same structure, therefore I want to use the same
xpath to query the various data, but when I attempt to use
saxon:evaluate with the document variable in the string to
evaluate, it doesn't seem to process the document path
properly (seems to ignore the document portion of the path
string altogether). Here's the xslt:
The "new_and_old" template is called from the main template.
Here's the code snippet from the main template:
<xsl:call-template name="new_and_old">
<xsl:with-param
name="value_xpath">foo/bar/@version</xsl:with-param>
</xsl:call-template>
Here's the template I'm attempting to use to build output
using data from both sources.
<xsl:template name="new_and_old">
<xsl:param name="value_xpath"/>
<xsl:variable name="compare_file" select="document('doc_2.xml')"/>
<DataVersions>
<xsl:value-of select="saxon:evaluate($value_xpath)"/>
<xsl:text/>
<!-- <xsl:value-of
select="saxon:evaluate(concat($compare_file,'/',$value_xpath))"/> -->
<!-- <xsl:value-of select="saxon:evaluate($delta_xpath)"/> -->
<!-- <xsl:value-of select="saxon:evaluate(concat('$contentDoc',
$p1), $path)"/> -->
<!-- <xsl:value-of
select="saxon:evaluate(concat('$compare_file',$p1),$value_xpat
h)"/> -->
<!-- <xsl:value-of select="saxon:evaluate(concat('$p1',
$value_xpath), $compare_file)"/> -->
<!-- <xsl:value-of
select="$compare_file/saxon:evaluate($value_xpath)"/> -->
</DataVersions>
</xsl:template>
Both XML files (the one being transformed explicitly and the
compare_file) have the same structure. A simple example:
Source doc:
<foo>
<bar version="1"/>
</foo>
Compare doc (doc_2.xml):
<foo>
<bar version="2"/>
</foo>
The first saxon:evaluate function (uncommented) works fine.
I've been googling like mad and have tried lots of different
saxon:evaluate calls which include the $compare_file document
variable, but none of them work. The first commented example
is the closest to working, but returns the version value in
the source document rather than the compare_file document. I
know there are restrictions for saxon:evaluate regarding
variables, but I can't seem to find the right web page which
lays out the restrictions (and any workarounds) in any detail.
Any help would be appreciated.
Scott Lynch
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