Re: A problem using the xsl:key facility
The key() function, when called with two arguments, always searches within the current document (more accurately, the document containing the context node). Your xsl:for-each changes the current document, so you are searching the wrong thing. In XSLT 2.0 you can use the third argument of the key() function to indicate which document you want to search.
I've included some other comments on your code in case you find them helpful.
Calling boolean() is redundant here: the test attribute does it anyway.
That's a rather longwinded way of doing<xsl:element name="NestedDataset"> <xsl:attribute name="name"> <xsl:value-of select="@name"/> </xsl:attribute> <xsl:apply-templates/> </xsl:element>
You can almost invariably rewrite this as <xsl:variable name="sName" select="."/> (or perhaps select="string(.)"). This isn't just a stylistic issue, it's a lot more efficient to bind a variable to a node or a string than to construct a temporary tree.
Michael Kay Saxonica
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