The variable
<xsl:param name="objects"/>
is unrelated to the variable
<xsl:with-param name="objects" select="$objects" tunnel="yes"/>
because one is a tunnel parameter and the other isn't. So the non-tunnel
parameter gets it's default value, which is "".
To correct this, specify
<xsl:param name="objects" tunnel="yes"/>
To prevent it happening again (or to get better diagnostics next time you
make the mistake), some good practices are:
(a) On a parameter, specify required="yes" if you expect a value to be
supplied
(b) Declare the expected types of your parameters. Thus:
<xsl:param name="objects" required="yes" tunnel="yes" as="document-node()"/>
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Tim Lebo [mailto:timleboxslt(_at_)gmail(_dot_)com]
Sent: 14 May 2006 23:33
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Passing tree fragment as a tunneled param to
be accessed by key
All,
The input and output formats that I am working with both use IDs.
Unfortunately, the mapping between the IDs is rather complex.
Fortunately, I can dymanically determine the mapping. This is
done by creating elements within the transform (and in its
own namespace) that pair the ids. All of these pairings sit
in a variable in the / template.
My problem: While I'm processing the input structure with
apply-templates, when the input refers to an id, I need to
dip into my pairings variable to look up the appropriate
output id. I use a key for this and use the pairings variable
to define the tree fragment scope for the key. It appears
that when I pass the pairing variable into the
apply-templates, it becomes a string and is not recognized as
a tree fragment.
Hopefully any ambiguity of my description will be absolved
with the following domain-independent code. The Input,
current xsl, and desired output follow.The xsl includes
comments describing current problem in code.
Kindest thanks and highest regards,
Tim
current xsl throws two errors:
Error on line 34 of file:/Users/tml/Desktop/question/attempt.xsl:
XPTY0019: Required item type of first operand of '/' is
node(); supplied value has item
type xs:string
Transformation failed: Run-time errors were reported
Error on line 37 of file:/Users/tml/Desktop/question/attempt.xsl:
XPTY0019: Required item type of first operand of '/' is
node(); supplied value has item
type xs:string
Transformation failed: Run-time errors were reported
======== input ==========
<in-objects>
<in-object ref="AAA"/>
<in-object ref="BBB"/>
<in-object ref="CCC"/>
</in-objects>
======== desired output =========
3
<out-object>
<refers-to>input @ref: AAA count($objects/*): 3 get
@out-id: 111</refers-to> </out-object>
========= current xsl ==========
<xsl:transform version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xfm="intermediate nodes created during transform not
in input and not for final output"
exclude-result-prefixes="xfm">
<xsl:output method="xml" indent="yes"/>
<xsl:key name="objects" match="xfm:object" use="@in-id"/>
<xsl:template match="/">
<xsl:variable name="objects">
<!-- This would be generated with an apply-templates, but
is hard coded for example -->
<xfm:object in-id="AAA" out-id="111">text a 1</xfm:object>
<xfm:object in-id="BBB" out-id="222">text b 2</xfm:object>
<xfm:object in-id="CCC" out-id="333">text c 3</xfm:object>
</xsl:variable>
<xsl:value-of select="count($objects/*)"/>
<xsl:apply-templates select="in-objects">
<xsl:with-param name="objects" select="$objects" tunnel="yes"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="in-objects">
<xsl:apply-templates select="in-object[1]"/> </xsl:template>
<xsl:template match="in-object">
<xsl:param name="objects"/>
<out-object>
<refers-to>
<xsl:value-of select="concat('input @ref: ',@ref,' ')"/>
<!-- LINE 34: I expect $objects to be a tree fragment
of 3 xfm:object here, but it is a string. -->
<xsl:value-of select="concat('count($objects/*):
',count($objects/*),' ')"/>
<!-- LINE 37: After $objects is a tree fragment here,
this does not select '111' -->
<xsl:value-of select="concat('get @out-id:
',$objects/key('objects',@ref)/@out-id)"/>
</refers-to>
</out-object>
</xsl:template>
<xsl:variable name="NL">
<xsl:text>
</xsl:text>
</xsl:variable>
</xsl:transform>
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