- From: Jeni Tennison <jeni@jenitennison.com>
- Date: Fri, 8 Mar 2002 14:54:43 +0000
- To: Piccand Régis <regis.piccand@imtf.ch>
- CC: "'Beyer,Nathan'" <NBEYER@cerner.com>, "Schema Dev XML (E-mail)" <xmlschema-dev@w3.org>
Hi Piccand,
> I'm trying to have an unordered list of elements that can be
> "mandatory OR optional" AND repeatable (i.e. elements are unordered
> and "MinOccurs" and "MaxOccurs" must be specified for each element).
>
> Using "All", maxoccurs is bound to 1 (optional but not repeatable).
> Using "sequence", elements are ordered (optional and repeatable).
> Using "choice", elements are optional (repeatable but not
> mandatory).
>
> Is there a possibility to achieve what I'm trying to do ?
Basically, no, not with XML Schema. Your options are to:
- create a content model that expresses all possible combinations of
the elements (usually impractical)
- use a choice, and then use another schema language, such as
Schematron, to express the constraints about elements that must be
present
- create a schema for a canonical form of the markup language in
which the elements must occur in a specific order, then use a
transformation to get instance documents into that canonical
ordering prior to validation
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
Received on Friday, 8 March 2002 09:54:46 UTC