XSLT question

[GringoStarr]

Hi,

I'm quite new to xslt and I'm trying to understand the inner for-loop in the code below. I think
it loops over all <ClassifiedProductDefinition> elements with a <SpeciesGroupKey> that matches the
the one in <SpeciesGroupDefinition> and where none of the preceding <ClassifiedProductDefinition>
elements have the same <SpeciesGroupKey> and <ProductGroupName> as the current <ClassifiedProductDefinition>
element. Is this correct or am I missing something here?

<xsl:variable name="productGroups">
   <xsl:for-each select="hpr:SpeciesGroupDefinition">
     <xsl:variable name="species" select="hpr:SpeciesGroupKey"/>
	<xsl:for-each select="../hpr:ProductDefinition/hpr:ClassifiedProductDefinition[hpr:SpeciesGroupKey = $species and not(./hpr:ProductGroupName = preceding::[hpr:SpeciesGroupKey = $species]/hpr:ProductGroupName)]">
	  <Product>
	    <xsl:copy-of select="hpr:SpeciesGroupKey"/>
	    <xsl:copy-of select="hpr:ProductGroupName"/>
	  </Product>
       </xsl:for-each>
    </xsl:for-each>
</xsl:variable>

[salem_c]

My first suggestion would be for you to generate a minimal XML document containing a couple of elements
- one which passes the tests (as you understand it)
- one which fails the tests

Or take an existing document and make a copy of it, containing just a few representative elements.

Does applying your xslt to that document produce the result you want?

[GringoStarr]

Thanks for the suggestion, Salem. What I'm not sure of is if the condition [hpr:SpeciesGroupKey = $species]
is negated or if it selects all elements with same <SpeciesGroupKey> and different <ProductGroupName>.
I didn't write the xslt code. I'm just trying to understand what it does.