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RE: Entity replacement

• From: David Seibert <dseibert@s...>
• To: "xml-dev@i..." <xml-dev@i...>, "'Peter Murray-Rust'" <Peter@u...>
• Date: Mon, 31 Mar 1997 09:51:39 -0800

1) PEs aren't supposed to be recognized inside comments (nothing is except the
terminal '*-->'), so they aren't supposed to be expanded.  This is also true for
entities in cdata.
2) Expansion of comments inside parameter entities shouldn't matter, since
comments can go anywhere that PEs can.  The exact treatment could probably
depend on the application handling the document.

David

----------
From: 	Peter Murray-Rust
Sent: 	Sunday, March 30, 1997 3:55 AM
To: 	xml-dev@i...
Subject: 	Re: Entity replacement

In message <199703300546.VAA18376@j...> Sean Russell writes:
> I was told this was a hotly debated topic, and I was wondering what the cur

Probably by me :-), so I'll try to answer.

> rent status was.  This is regarding section 4.3 of the XML working draft, 1
> 4-Nov-96.
> 
> As regards #2, #3, and #6, which claim that internal entities should be pro
> cessed and replaced by their values by the parser before the data is return
> ed to the application, will this requirement be changed?

The problem as I see it is not that anything requires change, but rather
clarification.  The main problem seems to be with parameter entities.
The sort of problem that *I* don't know the answer to is whether a 
parameter entity in a comment is expanded or whether a comment in a 
parameter entity is expanded and in which order.  Another is that PEs can
be nested something like:
<!ENTITY % hairy "<!ENTITY % foo 'bar'>">
but I doubt if I have got this right (I've deleted the WG discussion).
I also know from experience that *authoring* PEs can be quite tricky
(I used this at one stage to mimic directory names in resolving entities
and you have to get the quotations just right).  It's therefore even more
important to get the parsing right :-)

The Editorial Review Board has promised enlightenment in the nearish future.

If your are really keen on this have a play with a full sgml parser such as
nsgmls and see how PEs are treated there.

	P.

> 
> --- SER
> 
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-- 
Peter Murray-Rust, domestic net connection
Virtual School of Molecular Sciences
http://www.vsms.nottingham.ac.uk/

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