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- From: rbourret@dvs1.informatik.tu-darmstadt.de (Ron Bourret)
- To: xml-dev@ic.ac.uk
- Date: Tue, 9 Jun 1998 15:59:07 +0200
Rick Jelliffe wrote:
> An equivalent term for "entity" is "predeclared resource".
>
> So are you saying that all identifiers of resources are not allowed, or only
> that predeclarations are not allowed?
Predeclarations. That is, XSchema should not support a mechanism for declaring
entities.
As Paul Prescod pointed out a while back, elements and attribute declarations
define a logical structure for an XML document. Entity declarations and
references define its physical structure.
If we view XSchema as defining the logical structure, not as defining the
physical structure or providing a wholesale replacement for the DTD (and I think
we should), entity declarations have no place in XSchema. Another way of saying
this is that XSchema applications should not be in the business of resolving
entity references.
This does not preclude the use of entity references in documents that refer to
XSchema documents -- the requirement, for example, that a document that refers
to an XSchema document can't include & is a bit onerous, to say the least.
It might not even preclude the declaration and use of general entities in
XSchema documents themselves -- this is still up for discussion, but a frequent
suggested replacement for parameter entities in XSchema is the use of parsed
general entities in the XSchema document itself.
-- Ron Bourret
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