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Look at <interleave> from RELAX NG [1]. You can also use Trang [2], a Java
tool by XML wundermensch James Clark that infers RELAX NG and XSD schemas
from XML and translates from RNG to XSD. Then validate against these schemas
with Sun's Multi-schema Validator [3], a Java tool written by Kawaguchi
Kohsuke that validates Relax, RELAX NG, XSD, and DTD. See full examples [4].
Trang generates suitable constructs, other than <interleave>, to construct
schemas that work for both RNG and XSD.
Mike
[1]
http://www.oasis-open.org/committees/relax-ng/tutorial-20011203.html#IDAN1YR
[2] http://thaiopensource.com/relaxng/trang.html
[3] http://wwws.sun.com/software/xml/developers/multischema/
[4] Examples:
C:\XML\Rng\Examples>cat ex1.xml
<ex>
<a/>
<b/>
<c/>
<d/>
<e/>
<f/>
</ex>
C:\XML\Rng\Examples>cat ex2.xml
<ex>
<grp>
<a/>
<b/>
</grp>
<c/>
<grp>
<d/>
<e/>
<f/>
</grp>
</ex>
C:\XML\Rng\Examples>cat ex3.xml
<ex>
<a/>
<grp>
<b/>
<c/>
<d/>
</grp>
<e/>
<f/>
</ex>
C:\XML\Rng\Examples>java -cp c:\lib\trang.jar;c:\lib\jing.jar -jar
c:\lib\trang.jar e
x1.xml ex2.xml ex3.xml ex.rng
C:\XML\Rng\Examples>java -jar c:\lib\msv.jar ex.rng ex1.xml ex2.xml ex3.xml
start parsing a grammar.
validating ex1.xml
the document is valid.
--------------------------------------
validating ex2.xml
the document is valid.
--------------------------------------
validating ex3.xml
the document is valid.
C:\XML\Rng\Examples>java -jar c:\lib\msv.jar ex.xsd ex1.xml ex2.xml ex3.xml
start parsing a grammar.
validating ex1.xml
the document is valid.
--------------------------------------
validating ex2.xml
the document is valid.
--------------------------------------
validating ex3.xml
the document is valid.
C:\XML\Rng\Examples>
> -----Original Message-----
> From: Hunsberger, Peter [mailto:Peter.Hunsberger@stjude.org]
> Sent: Monday, March 10, 2003 8:36 AM
> To: 'xml-dev@lists.xml.org'
> Subject: [xml-dev] Arbitrary grouping
>
>
> I'm new to XML schema and am confused on how I would create a schema that
> introduces a set of arbitrary grouping for a set of elements.
> For example:
>
> <x>
> <a/>
> <b/>
> <c/>
> <d/>
> <e/>
> <f/>
> </x>
>
> or
>
> <x>
> <group>
> <a/>
> <b/>
> </group>
> <c/>
> <group>
> <d/>
> <e/>
> <f/>
> </group>
> </x>
>
> or perhaps
>
> <x>
> <a/>
> <group>
> <b/>
> <c/>
> <d/>
> </group>
> <e/>
> <f/>
> </x>
>
> would all be considered valid. Additional constraints are that any number
> of groups can occur, but the elements a through f can each only occur a
> maximum of once inside the x element whether they are children of
> a group or
> not.
>
> Peter Hunsberger
>
>
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