RE: is "foo element(foo/1/3)" a valid xpointer?

I have no recollection of falling back to a shorthand pointer
ever being discussed.

I think the BNF is pretty clear. It can be a shorthand pointer, or
a scheme based one. There is no mixture.

You could say element(foo/1/3)element(foo) to get a fallback
behavior.

Ron 

> 
> -----Original Message-----
> From: www-xml-linking-comments-request@w3.org 
> [mailto:www-xml-linking-comments-request@w3.org] On Behalf Of 
> Paul Grosso
> Sent: Tuesday, April 15, 2003 2:56 PM
> To: www-xml-linking-comments@w3.org
> 
> 
> At 23:45 2003 04 15 +0200, Daniel Veillard wrote:
> >On Tue, Apr 15, 2003 at 04:21:11PM -0500, Paul Grosso wrote:
> >
> >> In particular, suppose we want to point to element(foo/1/3)
> >> but fall back to just pointing to the element with id=foo
> >> if the element scheme isn't supported.  I'd expect to write
> >> something like:
> >> 
> >>       href="mydoc.xml#foo element(foo/1/3)"
> >
> >  Hum, that's the way around, aren't schemes evaluated from
> >left to right ? That would not work anyway.
> 
> Ah, you're right about the order.  So what I want to work is:
> 
>   href="mydoc.xml#element(foo/1/3)foo"
> 
> >> But reading the BNF at [1], it looks to me like Pointer
> >> can be either a Shorthand or SchemeBased, but not both,
> >
> >  that's my understanding too.
> >
> >> and SchemeBased consists of PointerParts that each
> >> require a SchemeName, so I don't see how what I show
> >> above can be allowed by this grammar.
> >
> >  I don't think you can't expect any fallback mechanism 
> >with the current set of specs if element() is not supported.
> 
> Well, it's not just if it isn't supported.  It's also if
> the given element child sequence has a resource error
> (that is, fails to find an element).  And I really think
> we want to be able to fall back from element() to shorthand.
> 
> Does anyone else remember if we did this on purpose or if
> we meant to allow falling back to a shorthand pointer?
> 
> paul
>

Received on Tuesday, 15 April 2003 18:11:05 UTC