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   Re: entities in XML Schema

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  • From: Daniel Veillard <Daniel.Veillard@w3.org>
  • To: "Henry S. Thompson" <ht@cogsci.ed.ac.uk>
  • Date: Mon, 13 Mar 2000 15:48:09 +0100

On Mon, Mar 13, 2000 at 10:18:01AM +0000, Henry S. Thompson wrote:
> "Mark Volkmann" <volkmann@inlink.com> writes:
> > I've poured over all three parts of the XML Schema working draft (0, 1 & 2)
> > and cannot find anything similar to entity definitions in DTDs. Am I missing
> > it or has that functionality been omitted from XML Schema on purpose?
> Yes.  Since XML Schema begins work on the infoset of a well-formed
> (perhaps valid) XML document, parsed entity definition substitution
> has already taken place.  We decided a two-pass architecture was too
> clunky, and arguably impossible, and concluded the best thing was to
> leave XML 1.0 entities to XML 1.0 mechanisms (i.e. you can define
> entities in the internal subset) .

  Note also the existing XInclude proposal

which could ultimately provide a non-Dtd based replacement for
external parsed entities. This is one piece of the puzzle which
is being handled by the XML Core WG now (started in the Linking
WG). The pieces are:

  - XInclude for external parsed entities
  - XML Schemas URI type to detect external entities
  - XLink constructs to build links

However I don't see any way to replace internal entities. However
IMHO internal entities are fine (easy to declare and handle).


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