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   RE: [xml-dev] XRules: Mind your own business rules

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Greetings Waleed, if you feel that the XForms Core module is too coarse a granule to reuse for your purposes then perhaps you would like to look at the bind element and see if that would meet your need and if so why not provide feedback to the XForms group that you would like to see it as a module.

XForms uses XML Schema as its basic type validation scheme upon which can be layered XForms constraints. The SChema types can be associated in three ways, the "normal" schema one of associating a schema with the document, the xsi:type approach or an xforms supplied feature of bind that allows at type to associated with a node in a manner similar to xsi:type but without having to change the document.

Regards, Roland

"Waleed Abdulla" <Waleed_Abdulla@xrules.org>

11/03/2005 17:12

"'Mark Seaborne'" <mseaborne@origoservices.com>, <xml-dev@lists.xml.org>
RE: [xml-dev] XRules: Mind your own business rules

> -----Original Message-----
> From: Mark Seaborne [mailto:mseaborne@origoservices.com]

> I would concur with Roland Merrick on this issue. The XForms model has
> great
> potential as a way of defining distributable business rule sets (whether
> or
> not you need a form).

I started reviewing ver 1.1 of the specs after Roland's comments. It's my
feeling that a language to express business rules deserves to be a first
class citizen in the standards world. If the XForms workgroup considers
expanding on their dynamic model (add rule grouping mechanisms,
context-sensitive embedding in XSD, standardized error reporting ...etc) and
branching out the effort into a separate standard that works equally well
with XForms and with other standards, then that would be something
wonderful. How about it W3C?

> The nice thing is that it the declarative rules are
> designed to layer over an existing XML schema language (W3C XML Schema).
> So
> the XForms model could be seen as XSD extensions

I'll read more about this, but what I know so far is that XForms uses the
XML Schema data types. Is there more to it?

> I notice that you have already had a reply from Rick Jelliffe, mentioning
> that Schematron is also a good fit for your requirements. You might want
> to
> look at the ISO DSDL activity that is working to allow combinations of
> Relax
> NG and Schematron schemas. In many ways the combination of XSD + XForms
> Model mirrors Relax NG + Schematron.
> So, if you think you can build on work that has already been done, or is
> in
> progress, or even feed requirements directly into those efforts, please
> do.

That's the general plan. If there is enough similarity and compatibility,
convergence makes a lot of sense. I'll study this in more detail. Thanks
Mark and Rick for the pointers.


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