Florent Georges wrote:
Michael Kay wrote:
<xsl:for-each-group select="*" group-by="name()">
I know name() is widely used as a grouping key, but I wonder if we
shouldn't use node-name(.) instead, to be more coherent regarding
namespaces handling. The same way we advice to use self::ns:name
instead of name() eq 'ns:name'.
apart from some special characteristics (i.e., empty string vs an empty
sequence and some others), name() is defined as string(node-name($arg)).
I agree with your point that using it node-name() instead of name()
would be more "correct", but knowing that many people come from XSLT 1.0
where they are used to using name(), I don't really see the difference
(even though one might argue that a string is compared differently than
a QName).
One special situation occur, perhaps, where the source document has
different redefining namespaces with the same prefix (or different null
namespaces). In that case and in the rare event that the node names
match, the node-name() function will result in unequal and the name()
function will result in equal:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0">
<xsl:output method="text" />
<xsl:variable name="testset">
<date xmlns="http://foo"; />
<date xmlns="http://bar"; />
</xsl:variable>
<xsl:template match="/" name="start">
<xsl:value-of select="
'node-name comparison:',
node-name($testset/*[1]) eq node-name($testset/*[2])" />
<xsl:text>
</xsl:text>
<xsl:value-of select="
'name comparison:',
name($testset/*[1]) eq name($testset/*[2])" />
</xsl:template>
</xsl:stylesheet>
Will output the following:
node-name comparison: false
name comparison: true
So, all in all and in the end, to prevent hard to find errors, I tend to
agree with your advice and adopt it as a "best practice".
Cheers,
-- Abel Braaksma
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