At 2009-10-06 18:22 +0100, Andy Chambers wrote:
I'm playing around with the added features available in key
declarations but I think I must be misunderstanding
something. Here's my key declaration (I realize that this particular
example would be better as a simple
@use but I want to understand how it works to see if it might make
some of my other keys look a little
better)....
<xsl:key name="keyNames"
match="name | mdv">
<lookup oid="{(_at_)oid}"/>
</xsl:key>
According to http://www.w3.org/TR/2007/REC-xslt20-20070123/#xsl-key
the value of the key is atomized. Your key is an element node. The
typed value of the element node is the string value (untypedAtomic)
of the text content, in your case an empty string, according to:
http://www.w3.org/TR/2007/REC-xslt20-20070123/#dt-atomization
and
http://www.w3.org/TR/2007/REC-xpath-datamodel-20070123/#const-infoset-element
(typed-value)
I thought that to use this key to lookup the @name associated with
@oid="AA.AA" for example, I'd do
<xsl:variable name="lookup">
<lookup oid="AA.AA"/>
</xsl:variable>
<xsl:sequence select="key('keyNames', $lookup)/@name"/>
According to http://www.w3.org/TR/2007/REC-xslt20-20070123/#keys the
lookup value is an atomic value. Your key being passed is a document
node and the atomized value is the string value of that tree, which
in your example is the empty string.
But this actually returns a sequence containing all the @names.
I seek enlightenment as to why this is so :-)
Every member in your key table has the empty string as the associated
key value, and you are looking up the key value using an empty
string. Thus, every member of the key table is being returned to
you, so you are getting every attribute.
I hope this helps.
. . . . . . . . . . Ken
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