XSL Variable problem

[Norman Barker]

Hi,
I have the following template
<xsl:template match="midas:Request">
<xsl:variable name="var1"
select="string(./midasataDescriptorGUID/@GUID)"/>
<test>
<result1><xsl:copy-of
select="$OGC_Type[string(midasataDescriptorGUID/@GUID) = @guid]"/></result1> <result2><xsl:copy-of select="$OGC_Type[$var1 = @guid]"/></result2> </test> </xsl:template>

result2 works fine, and I see the XML fragment, yet result1 is empty!

Am I missing a trick, result2 should be the same as result1. Unfortunately in the stylesheet I can't pre-declare the variable since I want to use it in a key.

Thanks

Norman

 

[Joris Gillis]

I have the following template
<xsl:template match="midas:Request">
<xsl:variable name="var1" select="string(./midasataDescriptorGUID/@GUID)"/> <test> <result1><xsl:copy-of select="$OGC_Type[string(midasataDescriptorGUID/@GUID) = @guid]"/></result1> <result2><xsl:copy-of select="$OGC_Type[$var1 = @guid]"/></result2> </test> </xsl:template>

result2 works fine, and I see the XML fragment, yet result1 is empty!

Am I missing a trick, result2 should be the same as result1. Unfortunately in the stylesheet I can't pre-declare the variable since I want to use it in a key.

Hi,

interesting question , you're indeed missing a trick.

in this Xpath expression:
<xsl:variable name="var1" select="string(./midasataDescriptorGUID/@GUID)"/> the period (.) selects the context node, which - in this case- is equal to the current node-set of the template (the 'midas:Request' element).

But between the [brackets] in:
<xsl:copy-of select="$OGC_Type[string(midasataDescriptorGUID/@GUID) = @guid]"/> , the context node is changed to the node preceding the left bracket ($OGC_Type). So this expression is trying to access the 'midasataDescriptorGUID' child nodes of '$OGC_Type', which do not exist. In other words, you cannot access the current node-set with '.' when you're between brackets. You have to use 'current' in stead.

use this:
<xsl:copy-of select="$OGC_Type[string(current/midasataDescriptorGUID/@GUID) = @guid]"/>

Hope this helps.

regards,

 

[David Carlisle]

Hi,
I have the following template
<xsl:template match="midas:Request">
<xsl:variable name="var1"
select="string(./midasataDescriptorGUID/@GUID)"/>
<test>
<result1><xsl:copy-of
select="$OGC_Type[string(midasataDescriptorGUID/@GUID) = @guid]"/></result1> <result2><xsl:copy-of select="$OGC_Type[$var1 = @guid]"/></result2> </test> </xsl:template>

result2 works fine, and I see the XML fragment, yet result1 is empty!

Am I missing a trick, result2 should be the same as result1. Unfortunately in the stylesheet I can't pre-declare the variable since I want to use it in a key.

Thanks

Norman

your variable var1 is the string value of the
../midasataDescriptorGUID/@GUID
evaluated from teh current midas:Request node.
so result2 selcts elements from $OGC_Type whose guid attribute is equal to that.

in $OGC_Type[string(midasataDescriptorGUID/@GUID) = ... the midasataDescriptorGUID/@GUID is evaluated relative to each element in the $OGC_Type mode set.

so this is probably a different value.

David