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Re: Conditional xml Schema

• To: "Joe Schaffner" <schaffner.joe@g...>
• Subject: Re: Conditional xml Schema
• From: "Ramkumar Menon" <ramkumar.menon@g...>
• Date: Sun, 11 Jun 2006 11:10:16 -0700
• Cc: "Jirka Kosek" <jirka@k...>, "Jagdishwar B" <jagdishwar.beemanati@g...>, xml-dev@l...
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• In-reply-to: <514a17f50606111023v4e3cc445na9330e90f6b9066d@m...>
• References: <536ca77f0606110242g2b5a8f01x1d6056ce08db44ba@m...> <448BF350.2000409@k...> <514a17f50606111023v4e3cc445na9330e90f6b9066d@m...>

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@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
> > ------------------------------------------------------------------
> >   Profesionální školení a poradenství v oblasti technologií XML.
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> >
> >
> >
>


-- 
Shift to the left, shift to the right!
Pop up, push down, byte, byte, byte!

-Ramkumar Menon
 A typical Macroprocessor

• References:
  • Conditional xml Schema
    • From: "Jagdishwar B" <jagdishwar.beemanati@g...>
  • Re: Conditional xml Schema
    • From: Jirka Kosek <jirka@k...>
  • Re: Conditional xml Schema
    • From: "Joe Schaffner" <schaffner.joe@g...>

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