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   Re: Entities and namespaces in XSchemata

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  • From: Peter Murray-Rust <peter@ursus.demon.co.uk>
  • To: "John E. Simpson" <simpson@polaris.net>,"Xml-Dev (E-mail)" <xml-dev@ic.ac.uk>
  • Date: Sat, 30 May 1998 14:39:27

At 09:14 30/05/98 -0400, John E. Simpson wrote:
>Question: I'd understood XSchema to be an attempt to eliminate the need to
>do *any* DTD coding. If that's the case, why define general entities using
>the DTD form? Wouldn't some thing like this work?:
><!DOCTYPE xschema SYSTEM xschema.dtd>
>  <Entities>
>    <EntityType id="greetings.content" repltext="#PCDATA"/>
>  </Entities>
>  <ElementType id="greetings">
>    <Content>
>      <Seq repeatable="no" optional="no">&greetings.content;</Seq>
>    </Content>
>  </ElementType>
>That is, why not abstract entity declarations into XSchema form as well as
>the element declarations?

I expect that this is one of the questions that Simon will be asking :-) I
think when I started I had assumed that we might wish to argue for your
example. It might then get translated automatically into:

<!ENTITY greetings.content "#PCDATA">
<!ELEMENT greetings (&greetings.content)>

Whereupon the parser takes over. I had simply suggested that the parser
could operate at an earlier stage.  I expect that Simon will guide us
through this :-) and I would expect a question like:

"Do we wish to define entities in an XSchema?"


Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary

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