Re: [xslt] XML_DOCUMENT_NODE and boolean testing

[Nick Wellnhofer <wellnhofer aevum de>]

Nick Wellnhofer wrote:
> Phil Shafer wrote:
> > Nick Wellnhofer writes:
> > > http://www.w3.org/TR/xslt#section-Result-Tree-Fragments
> > > "A result tree fragment is treated equivalently to a node-set that 
> > > contains just a single root node."
> >
> > This root node persists even after using ext:node-set().  Is
> > that correct behavior?
> >
> > > So a RTF is always a non-empty node-set and should evaluate to true.
> >
> > So my script should be saying 'test=$f/*' or 'count($f/*) > 0'?
> > No, I can't inspect an RTF, so I'd have to convert it to a
> > node-set first and then test it.
>
> The node-set returned by exsl:node-set() always has that root node, so 
> the test should be 'exsl:node-set($f)/*'. See here:
>
> http://www.google.com/search?q=exslt+node-set+%22root+node%22
>
> > It is certainly more convenient to test the variable directly,
> > but if that's not what the spec says, I'll close the bug and
> > use the above tests instead.
>
> You might try some other XSLT processors and see what they do. It seems 
> that the "XSLT Programmer's Reference" says on this topic:
>
> http://www.cygwin.com/ml/xsl-list/2000-08/msg01106.html
>
> "The result tree fragment is first converted to a string, and the string 
> is then converted to a Boolean.  The resulting boolean is true if the 
> result tree fragment contains any non-empty text nodes, and is false 
> otherwise."
>
> But I think that contradicts the spec and libxslt is correct. The spec 
> clearly says:
>
> http://www.w3.org/TR/xslt#section-Result-Tree-Fragments
>
> "When a permitted operation is performed on a result tree fragment, it 
> is performed exactly as it would be on the equivalent node-set."
>
> So it shouldn't be converted to a string first.
>
> Nick

See also here:

http://mail-archives.apache.org/mod_mbox/xml-xalan-dev/200009.mbox/%3C39B816AA 89166FFC firstech com%3E
http://www.google.com/search?q=xslt+%22result+tree+fragment%22+boolean

Nick


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