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From Frans Thamura <fth4m...@yahoo.com>
Subject Re: UML models of psml and xreg
Date Thu, 02 Aug 2001 08:47:48 GMT
Thanks.. for the UML... I used it for my dev..


--- Dave Carlson <dcarlson@ontogenics.com> wrote:
> I'm building a set of tools for generating and
> reverse-engineering XML Schemas
> from/to UML.  I attached two GIF diagrams of the
> current psml.xsd from CVS, as
> well as the xreg.xsd that was posted by Frans
> Thamura on 7/26.  These UML
> diagrams were produced by Rational Rose, but the
> model structure was
> automatically generated from the XSD source.  I only
> rearranged the diagrams
> to make them more readable.  I can also generate
> complete schemas from the
> same models.
> If there is interest on this list, I'll explain the
> process in more detail.
> But I thought the diagrams would be of interest.  I
> find that it is much
> easier to understand the concepts and relationships
> via a diagram.
> As part of this, I discovered a few technical errors
> in the schemas.  Both
> schemas use the XSD <all> content model incorrectly.
>  I really wish that it
> did work like this!   However, an <all> group cannot
> directly contain any
> elements that have cardinality other than 1..1 or
> 0..1.  Both schemas contain
> one or more <all> groups with elements having
> maxOccurs=unbounded, which is
> not allowed.
> Unfortunately, this means that we must use either
> <sequence> or <choice
> minOccurs="0" maxOccurs="unbounded"> instead of
> <all> for these complexTypes.
> If you want to validate the cardinality of child
> elements, we must use
> <sequence>.  Or, we use <choice> and basically punt
> on the strictness of
> validation.  I have not looked at Caster, but how
> does it handle these
> alternatives?
> In addition, the psml.xsd schema must declare a
> namespace prefix for the
> targetNamespace.  Or, the XMLSchema namespace must
> use a prefix and allow the
> psml targetNamespace to use the default namespace. 
> I've added the xsd: prefix
> to schema elements and will test the schema before
> posting it back to the
> list.
> Any preferences for how to handle the <all> problem?
> As an aside, I'm working on a major upgrade to my
> http://XMLmodeling.com
> portal.  It's currently running a very old 1.2 beta
> version of Jetspeed.  I
> plan to update to the current version with user
> logins and customization.  I
> also plan to make some of my UML to XSD conversion
> tools available as a web
> application within this portal. So, you'll see more
> messages from me as I try
> to figure out the templating system and
> modifications to the turbine_user
> database table...
> Cheers,
>   Dave Carlson

> ATTACHMENT part 2 image/gif name=xreg.gif

> ATTACHMENT part 3 image/gif name=psml.gif
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