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XSD supports this type of behaviour in various ways.
One way is to define a base type (fruit) and extend it with other types (apple, orange). Then when defining the container element, you would define it as having children of type fruit. The instance document could incorporate either type.
Another way is to use the choice element in your schema. It matches one of a specific list of types. To have several fruit (each of which might be apple or orange) you can use the minOccurs and maxOccurs attributes on the choice.
-Erik
> -----Original Message-----
> From: Ramkumar Menon [mailto:ramkumar.menon@gmail.com]
> Sent: June 11, 2006 2:10 PM
> To: Joe Schaffner
> Cc: Jirka Kosek; Jagdishwar B; xml-dev@lists.xml.org
> Subject: Re: [xml-dev] Conditional xml Schema
>
> 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.
> > >
> > > --
> > > ------------------------------------------------------------------
> > > Jirka Kosek e-mail: jirka@kosek.cz http://www.kosek.cz
> > > ------------------------------------------------------------------
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> > >
> > >
> >
>
>
> --
> Shift to the left, shift to the right!
> Pop up, push down, byte, byte, byte!
>
> -Ramkumar Menon
> A typical Macroprocessor
>
>
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