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- From: John Cowan <cowan@locke.ccil.org>
- To: XML Dev <xml-dev@ic.ac.uk>
- Date: Fri, 18 Jun 1999 12:46:30 -0400
Paul Prescod wrote:
> XML ended up breaking too many other SGML rules for this to happen. The
> empty end tag syntax was the most serious example but there are others.
This is a myth. As http://www.w3.org/TR/NOTE-sgml-xml says:
# NET delimiters can be used only to close an empty element. In SGML
# without the Web SGML Adaptations Annex, the NET delimiter
# is declared as />. With this approach, XML is not allowing null
# end-tags and is allowing net-enabling start-tags only for elements
# with no end-tag.
#
# In SGML with the Web SGML Adaptations Annex, there
# is a separate NESTC (net-enabling start tag close) delimiter.
# This allows the XML <e/> syntax to be handled as a combination
# of a net-enabling start-tag <e/ and a null end-tag >.
# With this approach, XML is allowing a net-enabling start-tag only
# when immediately followed by a null end-tag.
In short, XML empty tags are proper SGML, including pre-1996 SGML,
with some side constraints eliminating non-XML flexibilities
like "<foo/bogus content>", which "nsgmls -xml" duly complains about.
--
John Cowan http://www.ccil.org/~cowan cowan@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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