Re: [xml] xinclude on same resource - xpointer="element(c2/1)" fails

[Daniel Veillard <veillard redhat com>]

On Fri, Jan 29, 2010 at 12:48:06PM +0100, Piotr BaÅski wrote:
> Hi Daniel,
>
> A minor xptr/element()-spec-related point:
>
> On 2010-01-29 11:45, Daniel Veillard wrote:
> > On Fri, Jan 29, 2010 at 12:26:41AM +0100, c3459823592735 arcor de wrote:
> > > Hi,
> > >
> > >  I'm using xinclude with xpointer element()-scheme to include an existing element of the same resource 
> > > at a different location. The following bar.xml gives an example. In cruft-element with ID "c4" I'm 
> > > including <fnac>a</fnac>. In cruft-element with ID "c5" I'm trying to include <fnac>b</fnac>. In 
> > > cruft-element "c6" I'm trying to include <fnac>c</fnac> and added therefore a href="bar.xml" to avoid 
> > > any "Resource Error". I'm doing all this with IDs defined in bar.xsd. Here comes the complete example:
> > >
> > > <bar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> > > xmlns:xi="http://www.w3.org/2001/XInclude";
> > > xsi:noNamespaceSchemaLocation="bar.xsd">
> > > <fnorb id="snip">
> > > <cruft id="c1"><fnac>a</fnac></cruft>
> > > <cruft id="c2"><fnac>b</fnac></cruft>
> > > <cruft id="c3"><fnac>c</fnac></cruft>
> > > <cruft id="c4"><xi:include xpointer="element(/1/1/1/1)"/></cruft>
> > > <cruft id="c5"><xi:include xpointer="element(c2/1)"/></cruft>
> > > <cruft id="c6"><xi:include href="bar.xml" xpointer="element(c3/1)"/></cruft>
> > > </fnorb>
> > > </bar>
> >
> >   xmllint doesn't do ID ness for XSD based validation as far as I know,
> > at least not by default whe XIncluding it so your ID won't be found that
> > way ! Use xml:id it was designed exactly for that.
> >
> >   Also your second and 3rd espressions are wrong, element(c2/1) will
> > look for an element named c2 not for an element with an ID of c2.
> > use id() or @id constructs.
>
> The element() scheme allows for a shorthand pointer as the first step,
> so 'element(c2)' is equivalent to 'xpointer(id(c2))' (and '#element(c2)'
> is equivalent to '#c2'). I'm talking about the W3C spec, maybe it's
> "wrong" for xmllint, but I seem to recall it working, though I can't
> verify that right now.

  Ah, right it's element() not xpath() ... yes it does it, but
as stated you won't get any IDE from a linked XSD. Use xml:id attribute
or the xpath() based xpointer.

Daniel

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