Subject: Re: [xsl] Sibling axis and as="element()" From: "andrew welch" <andrew.j.welch@xxxxxxxxx> Date: Tue, 1 Aug 2006 11:42:17 +0100 |
> Given this XML: > > <xsl:variable name="foo" as="element(foo)+"> > <foo/> > <foo/> > <foo/> > </xsl:variable> > > I seem to remember David C mentioning something about using > as="element()" means the elements are no longer siblings... > but I can't find anything about it now. >
It's not a question of being "no longer" siblings. You've simply created three element nodes. You haven't attached them to any parent, therefore they are not siblings, and never were. If you want to make them siblings, use
<xsl:variable name="foo" as="document-node()"> <xsl:document> <foo/><foo/><foo/> </xsl:document> </xsl:variable>
or use the old syntax, which you can regard as an abbreviation for the above:
<xsl:variable name="foo"> <foo/><foo/><foo/> </xsl:variable>
Yes, thanks, it's becoming clearer although I'm still having issues with a "document" containing three root nodes that are all siblings.
<xsl:variable name="foo" as="document-node()"> <xsl:document> <foo/><foo/><foo/> </xsl:document> </xsl:variable>
...is this because "/[2]" was thought to be impossible, or a 1.0 compatiblity issue, but /[2] certainly exists here.
Ultimately this all stems from a desire to give every variable and parameter an "as" attribute to take advantage of the "fail-early" policy of XSLT 2.0. In a multiple pass setup I would normally use element()+ on a variable containing rootless elements, but have ran into this sibling issue*. I've switched to using document-node() but have now hit this slightly non-intuitive part of / having multiple children.
*It would be a useful feature if Saxon gave a warning if someone uses a sibling axis on an element in a rootless tree...similar to when the context node is an attribute (if that's feasible)
cheers andrew
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