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Re: syntax, model

• To: xml-dev@l...
• Subject: Re: syntax, model
• From: Liam Quin <liam@w...>
• Date: Fri, 24 Oct 2003 19:29:47 -0400
• In-reply-to: <4827EC373E03DB44AC2AB3900430896B672402@c...>
• References: <4827EC373E03DB44AC2AB3900430896B672402@c...>
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On Fri, Oct 24, 2003 at 10:19:19AM -0700, Jeff Lowery wrote:
> So if you took the verbiage of the Data Model, distilled it into formal
> symbolic description in a suitably expressive language, and then used that
> for validating purported Xpath/Xquery data models, whould that be a called a
> schema?

Possibly but it wouldn't be a very useful one.

See the XML Query 1.0 and XPath 2.0 Formal Semantics document [1] if
you are after a more formal description of processing instnces of
the XPath data model.

You could build an instance of the XPath Data Model from anything you
liked (a relational database table is a not unlikely example) as long
as you implemented the necessary properties described in [2].

In some sense, anything that constrains or describes the structure of a
formal system can be called a Schema, but in the context of xml-dev I
think people usually mean a Schema that constrains or describes a family
of XML documents.  Your example would not be a Schema over XML, but
instead it would be a Schema of XML Data Model Instances, which is not
at all the same thing.

Liam

[1] http://www.w3.org/TR/xquery-semantics/
[2] http://www.w3.org/TR/xpath-datamodel/

-- 
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/

• References:
  • RE: syntax, model
    • From: Jeff Lowery <Jeff.Lowery@c...>

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