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Siarhei Barysiuk

Subject: xsl:key, scope and creating of variable
Author: Siarhei Barysiuk
Date: 31 Oct 2006 11:58 AM

Hello!

I have a one problem and searching in the internet doesn't help me.

XSL:
...
<xsl:variable name="$tagsDoc" select="document('external.xml')"/>
<xsl:key match="tag" name="tags" use="@name"/>

<xsl:template name="templ_name">


<xsl:variable name="tags">

<xsl:for-each select="$tagsDoc">

<xsl:value-of select="key('tags','some_name')"/>
</xsl:for-each>

</xsl:variable>


</xsl:template>

Why cannot I define variable by this way? And does some way exist to define variable with node from external document by key()?

Thanks,
Siarhei Barysiuk

Ivan Pedruzzi

Subject: xsl:key, scope and creating of variable
Author: Ivan Pedruzzi
Date: 31 Oct 2006 06:17 PM

Hi Siarhei,

An half commented XSLT fragment is not enough to understand what you are trying to do.

If you want our help you have post a small working example XSLT + XML with a sample of the expected result.

Hope this helps
Ivan Pedruzzi
Stylus Studio Team

Siarhei Barysiuk

Subject: xsl:key, scope and creating of variable
Author: Siarhei Barysiuk
Date: 01 Nov 2006 08:42 AM

Hello Ivan,

For first thanks for reply.

I create small example:
- processor.xsl
- main.xml
- tags.xml

In example creating of variable will occur one time but in my project I need read extenal file many times and I decide that use of key() increases performance (I think it will be faster than direct select particular node through select="document('some_name')/tags/tag[.....]/@args" ).

Thanks,
Siarhei Barysiuk

example.zip
Example

James Durning

Subject: xsl:key, scope and creating of variable
Author: James Durning
Date: 01 Nov 2006 11:23 AM

The answer to your problem depends exactly on what you want to do.

If you want to loop through each of the tags in the external file, I suggest using <xsl:apply-templates select="document('tags.xml')"/>

--
If you only want to access the external file once, it may be better to use the variable like you have here: <xsl:variable name="$tagsDoc" select="document('external.xml')"/>
and use an node-set function when you want to access it later.

eg. with msxsl:
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
<xsl:value-of select="msxsl:node-set($tagsDoc)/tags/tag[@name='somevalue']"/>

or with exslt:
xmlns:exslt="http://exslt.org/common"
<xsl:value-of select="exslt:node-set($tagsDoc)/tags/tag[@name='somevalue']"/>

Using a node-set function is not necessary if you use XSLT 2.0.

Siarhei Barysiuk

Subject: xsl:key, scope and creating of variable
Author: Siarhei Barysiuk
Date: 01 Nov 2006 11:39 AM

Hi,

Yes, if I would access to external file once or few times. With $tagsDoc variable and select from it all work perfect. But it's slow (I think slower than it would be with key). I would like to increase speed of processing.

Thanks,
Siarhei

Siarhei Barysiuk

Subject: xsl:key, scope and creating of variable
Author: Siarhei Barysiuk
Date: 04 Nov 2006 05:29 AM

Hello,

I've resolve this problem by oneself. The main problem is xsl:value-of.
xsl:value-of return STRING but not NODE SET. In this example need to use xsl:copy-of which retun NODE SET.

The working example attached.

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