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Re: all group

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 30 Dec 2002 16:18:21 +0000
To: Herve Verjus <herve.verjus@esia.univ-savoie.fr>
Cc: Avin Patel <vze49rz3@verizon.net>, xmlschema <xmlschema-dev@w3.org>
Message-ID: <f5b4r8vpjjm.fsf@erasmus.inf.ed.ac.uk>

Herve Verjus <herve.verjus@esia.univ-savoie.fr> writes:

> Hi,
> 
> On Mon, 30 Dec 2002, Henry S. Thompson wrote:
> 
> >
> > "Avin Patel" <vze49rz3@verizon.net> writes:
> >
> > > Hi All,
> > > I want to use all group in all group. As I know all group can't have one of
> > > the following:
> > > 1)can't contain other group
> > > 2)can't be contained in other group
> > > 3)must be at top level of complex type
> > > 4)can't occur multiple time
> 
> eumH. Where did you find these constraints ????? I defined an XML Schema
> where 1) 2) and 4) are violated and the schema was validated (????)

In the REC [1]:

   * (all) . . . In this case, to reduce implementation complexity,
     {particles} is restricted to contain local and top-level element
     declarations only, with {min occurs}=0 or 1, {max occurs}=1.

and [2]:

   Schema Component Constraint: All Group Limited

     When a model group has {compositor} all all of the following must
     be true:

      1 one of the following must be true:

        1.1 It appears as the model group of a model group definition.

        1.2 It appears in a particle with {min occurs}={max occurs}=1,
            and that particle must be part of a pair which constitutes the
           {content type} of a complex type definition.

      2 The {max occurs} of all the particles in the {particles} of
        the group must be 0 or 1.

> What and where is the truth ?????

As above.  I guess not all validators are conformant in this area --
XSV doesn't enforce (1).

ht

[1] http://www.w3.org/TR/xmlschema-1/#Model_Groups
[2] http://www.w3.org/TR/xmlschema-1/#cos-all-limited
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]
Received on Monday, 30 December 2002 11:18:19 GMT

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