Re: [xslt] XML_DOCUMENT_NODE and boolean testing

[Nick Wellnhofer <wellnhofer aevum de>]

Is it possible that this is not a bug and the current behavior is 
correct? The spec says here:

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."

So a RTF is always a non-empty node-set and should evaluate to true.

Nick


Phil Shafer wrote:
> Daniel Veillard writes:
> >  maybe it's a bug, yes.
>
> This seems to fix it:
>
> Index: libxml2/xpath.c
> ===================================================================
> RCS file: /cvs/junos-2001/src/contrib/libxml2/xpath.c,v
> retrieving revision 1.8
> diff -u -p -r1.8 xpath.c
> --- libxml2/xpath.c     3 Apr 2008 21:26:20 -0000       1.8
> +++ libxml2/xpath.c     11 Jul 2008 13:33:51 -0000
> @@ -5940,6 +5940,16 @@ int
>  xmlXPathCastNodeSetToBoolean (xmlNodeSetPtr ns) {
>      if ((ns == NULL) || (ns->nodeNr == 0))
>         return(0);
> +    /*
> +     * If the only contents of the node-set are an
> +     * XML_DOCUMENT_NODE, then we have a fake document
> +     * returned by a template.  If it's empty, the
> +     * boolean value should be false.
> +     */
> +    if ((ns->nodeNr == 1)
> +       && (ns->nodeTab[0]->type == XML_DOCUMENT_NODE)
> +       && (ns->nodeTab[0]->children == NULL))
> +       return(0);
>      return(1);
>  }
>
> I'll open a bug report with this patch.
>
> Thanks,
>  Phil
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