[relaxng-user] specifying attribute choice

[David Tolpin]

> From dvd at davidashen.net Tue Feb 10 00:53:46 2004
> Date: Mon, 09 Feb 2004 15:42:25 -0500
> To: relaxng-user at relaxng.org
> From: "G. Ken Holman" <gkholman at CraneSoftwrights.com>
> Subject: RE: [relaxng-user] specifying attribute choice
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> At 2004-02-09 14:25 -0500, DuCharme, Bob (LNG-CHO) wrote:
> >Thanks Ken! That worked. Maybe I was misunderstanding the problem of the
> >original one, though, because the syntax of the solution still seems to tell
> >me that multiple x attributes are OK in the element.
>
> But that wouldn't be well-formed.  My reasoning was that a well-formedness 
> checker would stop the XML instance before the semantics of RELAX-NG 
> validation would kick in.  So the fact that the semantics might allow two 
> "x" attributes is moot because it would never have the opportunity to check 
> two "x" attributes.

The original solution, with group (the same as interleave for attributes)
does not work because of restriction 7.1.2, namely, oneOrMore//group//attribute
is not allowed. And it is not what you want anyway.

oneOrMore//choice//attribute is allowed, Ken is right.

It specifies the grammar you need because of well-formedness restriction.

David Tolpin