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Subject: Re: [regrep] [XML Schema issue] Replace choice with type substitution

If these type changes are made, would it create any confusion in the
developer community (differ design options used) and in adoption?

Although an iterative approach that minimizes the adoption impact would be a
good option.


Farrukh Najmi wrote:

> Farrukh Najmi wrote:
> >
> > Team,
> >
> > In new V3 schema we have consistently used type substitution instead
> > of choice construct when defining XMl schema. Choice in the pinion of
> > many is not very object oriented and implementation experience has
> > shown that it complicates design.
> >
> > I would like to ask if any one has objections if we replace
> > occurrences of <choice> in the schema with type substitution.
> To investigate this issue further I went ahead and removed choices from
> rim.xsd and query.xsd to see the full impact.
> It appears that modifying rim.xsd has relatively minor backward
> compatibility impact. However, the choice removal in query.xsd impacts
> Filter query schema in a major way. Although. the result is a much nicer
> filter query schema, the choice removal in query.xsd would create a huge
> burden on implementations as they will have to redo their implementation
> of Filter Query support.
> As an implementor of ebXML Registry I am OK with this but I suspect not
> every implementation would feel that way.
> Another consideration is that in V4 we may well support XQuery and
> deprecate Filter query.
> All this makes me wonder if the right thing may be to remove choices in
> rim.xsd (minor impact) and not remove choices in query.xsd (major impact
> to Filter query).
> Thanks for your thoughts.
> --
> Regards,
> Farrukh

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