Hi Clemens,
<xsl:for-each select="//INSTANCE[(_at_)class='Audio' or @class='Web-Site']">
<xsl:for-each select="key('tracker','Position')">
<item>
<xsl:attribute name="identifierref">
<xsl:value-of select="."/>
</xsl:attribute>
<title>
<xsl:value-of select="parent::INSTANCE/@name"/>
</title>
</item>
</xsl:for-each>
</xsl:for-each>
The key() function returns the nodes with a certain value for a
particular key. In the above, key('tracker', 'Position') will always
return the same node-set: all the nodes that, on the 'tracker' key,
have the value 'Position'. So you get an <item> for each of those
nodes, for each of the <INSTANCE> elements whose class is 'Audio' or
class is 'Web-Site'.
the problem is, that i don't want to use it on all "instance"
elements, but only on those whose class attributes are either
'Audio' or 'Web-Site', but the first for-each loop that is meant to
fulfill this purpose simply doesn't work, instead it always runs the
loop for all "instance" elements.
It sounds as though you want to filter the elements that are being
returned by the key, to only include those whose parent <INSTANCE>
element has a class of 'Audio' or 'Web-Site'. In that case, you need
to apply the filter (the predicate) to the node-set returned by the
key() function, as follows:
<xsl:for-each select="key('tracker', 'Position')
[parent::INSTANCE/@class = 'Audio' or
parent::INSTANCE/@class = 'Web-Site']">
...
</xsl:for-each>
On the other hand, I'm not sure why you're using the key() at all
here. I think that you could get the result that you want (from the
previous thread) with:
<xsl:for-each select="INSTANCE[(_at_)class = 'Audio' or
@class = 'Web-Site']">
<item identifier="{ATTRIBUTE[(_at_)name = 'Position']}">
<xsl:value-of select="@name" />
</item>
</xsl:for-each>
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list