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Re: Extending type definitions using RelaxNG Compact

• To: "Kristopher Brown" <Kristopher.Brown@d...>
• Subject: Re: Extending type definitions using RelaxNG Compact
• From: Jeni Tennison <jeni@j...>
• Date: Fri, 11 Jul 2003 15:36:46 +0100
• Cc: xml-dev@l...
• Envelope-to: xml-dev@l...
• In-reply-to: <0E6E2BCEEE1A154CA1FBDF39333BEE057CF63E@p...>
• Organization: Jeni Tennison Consulting Ltd
• References: <0E6E2BCEEE1A154CA1FBDF39333BEE057CF63E@p...>
• Reply-to: Jeni Tennison <jeni@j...>

Hi Kris,

> Unfortunately, the "FirstName = AlphaString" example doesn't work.
> Does anyone know a way of achieving what I'm trying to do? Is it
> even possible with RelaxNG?

RELAX NG doesn't support the construction of datatype hierarchies.
When you do:

  AlphaString = xsd:string {
      pattern = "[a-zA-Z]*"
  }

you are associating the name 'AlphaString' with a pattern that matches
strings made up of lower and uppercase ASCII letters. This isn't the
same as creating a new datatype called AlphaString.

In RELAX NG, datatypes come from a datatype library, and if you want
to create a new datatype, you have to create a new datatype library to
contain it. Currently that means coding it in your favourite
programming language, using the datatype library interface defined at
http://relaxng.sourceforge.net, registering that library with your
favourite RELAX NG validator and referring to it from your schema.

Alternatively, I was going to point you to ooRelaxNG at
http://www.asahi-net.or.jp/~eb2m-mrt/oo.html but I see that it doesn't
support simple type hierarchies (as XML Schema would call them). I
think that you could probably adapt the general principal -- create a
schema using a modified version of RELAX NG in which the datatype
hierarchy is made explicit, and then transform that schema into a
proper RELAX NG schema.

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/

• References:
  • Extending type definitions using RelaxNG Compact
    • From: "Kristopher Brown" <Kristopher.Brown@d...>

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