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Re: Conditional xml Schema

conditional xml
Cross field constraints are better off described thru rule based
validation languages like schematron. Use this in conjunction with the
XSD to enable cross field validation on fields.

<pattern name="checkMangoOrApple">
  <rule context="Fruit">
     <assert test="@myAttr='Apple' and elementApple1>If myAttr is
apple, elementApple1 should be present"/>
     <assert test="@myAttr='Mango' and elementMango1>If myAttr is
mango, elementMango1 should be present"/>

On 6/11/06, Joe Schaffner <schaffner.joe@g...> wrote:
> Why don't you define a Mango element and an Apple element, each with
> their own structure? I'll bet there is even a way to define a Fruit
> element, then derive an Apple and a Mango from Fruit. Then you would
> instantiate either type of fruit, Apple or Mango, and get the proper
> structure.
> Joe
> http://modern-greek-verbs.tripod.com/agv/
> PS
> It looks like you are trying to use the attribute to name the element
> type, which would be unnecessary, and it would surprise me if xsd --
> or any schema definition language -- would attribute class semantics
> to the arrtibutes you create arbitrarily. You are trying to place your
> metadata in the data domain.
> On 6/11/06, Jirka Kosek <jirka@k...> wrote:
> > Jagdishwar B wrote:
> >
> > > Is it possible to define the xml schema (xsd) conditionally based on
> > > certain values.
> >
> > No. You have to use RELAX NG or Schematron to express such constraints.
> >
> > --
> > ------------------------------------------------------------------
> >   Jirka Kosek     e-mail: jirka@k...     http://www.kosek.cz
> > ------------------------------------------------------------------
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> >
> >

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 A typical Macroprocessor


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