Additionally: You should focus on the "key" and "keyref" constructs for
primary key-"like" functionality. The pertinent reference in the W3C
Schema Primer[1] is "5.2 Defining Keys & their References".

[1] http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/

Kind Regards,
Joe Chiusano
Booz Allen Hamilton
Strategy and Technology Consultants to the World

> "James, David" wrote:
> 
> You can specify 'restrictions' within an xml schema. I found the
> x3schools xml schema tutorial
> (http://www.w3schools.com/schema/default.asp) a good start.
> 
> David
> 
>      -----Original Message-----
>      From: Carlos Torres <carlosttm@t...>
>      Sent: 12 August 2004 11:02
>      To: xml-dev@l...
>      Subject: [xml-dev] constraints
> 
>      I'm  starting with xml and I need to define some constraints,
>      something
> 
>      like primary keys in an scheme. I've been searching the web and
>      have
> 
>      fouond some references about it but I have not found any sample
>      or
> 
>      tutorial in this subject.
> 
>      Does anyone know a url of tutorials, samples or ... or whatever
>      that
> 
>      could help me to handle this?
> 
>      Thanks in advance.
> 
>      -----------------------------------------------------------------
> 
>      The xml-dev list is sponsored by XML.org <http://www.xml.org>, an
> 
>      initiative of OASIS <http://www.oasis-open.org>
> 
>      The list archives are at http://lists.xml.org/archives/xml-dev/
> 
>      To subscribe or unsubscribe from this list use the subscription
> 
>      manager: <http://www.oasis-open.org/mlmanage/index.php>

-- 
Kind Regards,
Joseph Chiusano
Associate
Booz Allen Hamilton