XSchema: unparsed entities

John Cowan cowan at locke.ccil.org
Fri Jul 24 23:29:36 BST 1998

Ron Bourret scripsit:

> One other difference I'd like to point out is that, with the exception of the
> "escape character" entities (lt, gt, amp, quot, and apos), I don't think you can
> construct an XML file with parsed entities that you cannot construct without
> them.

Actually, they too can be "compiled out" by clever use of character
references:  see the table in clause 4.6 of XML 1.0.

> This is not true of unparsed entities.  Not only would an UnparsedEntity
> element rectify this problem, it would also solve the validation problem pointed
> out by John Cowan with respect to ENTITY attributes: we can't validate their
> value without unparsed entity declarations.

Okay, I'm convinced.  (Note also that SAX supports them.)

How about:

<!ELEMENT UnparsedEntityDef>
<!ATTLIST UnparsedEntityDef
	SystemLiteral CDATA #REQUIRED
	PubidLiteral CDATA #IMPLIED

John Cowan	http://www.ccil.org/~cowan		cowan at ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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