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   RE: XSchema Spec, Sections 2.0 and 2.1 (Draft 1)

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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 

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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