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- From: "Rick Jelliffe" <email@example.com>
- To: "David Megginson" <firstname.lastname@example.org>,"XML Developers' List" <email@example.com>
- Date: Tue, 23 Mar 1999 13:31:12 +1100
From: David Megginson <firstname.lastname@example.org
>SGML does nothing that XML cannot do.
I don't know how Dave can say that.
For example, many asian documents use user-defined characters (East
Asian character sets have a special code space reserved for these, and
East Asian word processing applications come bundled with font editors
to allow definition of user-defined characters).
In SGML I can short-reference these codepoints to entity which points to
the appropriate glyphs and which has other data attributes to describe
In XML, to do this I have to write a special program to simulate this
And if the program just inserts elements rather than entity references
(because XML has no attributes on entities, so I have to use elements),
my element structure is made more complicated.
Furthermore I cannot use elements inside attribute values, while I can
use entity references. The lack of this kind in XML has closed off the
obvious and simple solution to private-use area (PUA) characters: East
Asians and MathML could each have found it useful.
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