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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"/>
</rule>
</pattern>
On 6/11/06, Joe Schaffner <schaffner.joe@gmail.com> 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@kosek.cz> 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.
> >
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