Arjun Ray scripsit:

>  (I suppose my
>  real agenda is putting PEs out to pasture, so I'd like a syntax that works
>  *against* "re-using" PEs for model groups in other declarations where
>  there is no semantic other than choice.)

FWIW, James Clark's program dtdinst, which transforms XML DTDs into
instance syntax intelligently, identifies the following PE purposes
(based on top-down analysis, not bottom-up lexical recognition):

model group
attribute group
attribute default value
attribute type
enumerated values
INCLUDE/IGNORE flag
attribute or element name
other
overridden

"Other" is integrated and not represented; "overridden" is for
entity declarations that are overridden by earlier ones.
See http://www.thaiopensource.com/dtdinst

-- 
John Cowan <jcowan@[...].com>      http://www.reutershealth.com
I amar prestar aen, han mathon ne nen,    http://www.ccil.org/~cowan
han mathon ne chae, a han noston ne 'wilith.  --Galadriel, _LOTR:FOTR_

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