W3C home > Mailing lists > Public > xmlschema-dev@w3.org > March 2006

Re: [xml-dev] Two Questions - on XML Schema

From: Pete Cordell <petexmldev@tech-know-ware.com>
Date: Thu, 9 Mar 2006 20:01:05 -0000
Message-ID: <000201c643b4$32ed13d0$0115a8c0@Elektonika.local>
To: <ElektonikaMail>
Cc: <xml-dev@lists.xml.org>, <xmlschema-dev@w3.org>

----- Original Message From: <noah_mendelsohn@us.ibm.com>
> The current thinking, at least among many WG members, is that <all> groups
> in their current forms are not usually implemented with the sort of FSM's
> that would exhibit combinatorial explosion.  Given that all groups are
> relatively separate from <sequence> and <choice>, there are
> implementations in which simple counters can be used to ensure that the
> number of elements seen meets the constraint.
> There is also discussion of more general support, in which <all> can be
> mixed with <sequence> and <choice>;  in that case, we do have to be very
> careful to understand the impact on the more general FSM and on
> restriction and extension.  For those reasons, I personally am nervous
> about proposing to mix <all> with other model groups, though we have had
> requests from some users.  Support for maxOccurs>1 may well make it into
> the working drafts for Schema 1.1.

Do you have a timetable on when you will be making decisions about <all>?  I 
was contemplating doing an implementation to verify it, but won't have the 
resource for 2 or 3 week.

Pete Cordell
Tech-Know-Ware Ltd
                         for XML to C++ data binding visit
                         (or http://www.xml2cpp.com)

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Received on Thursday, 9 March 2006 20:01:14 UTC

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