[Bug 181068] Review Request: html401-dtds - HTML 4.01 document type definitions

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Summary: Review Request: html401-dtds - HTML 4.01 document type definitions


https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=181068





------- Additional Comments From veillard at redhat.com  2006-02-12 14:35 EST -------
you can't mix sgml and xml resources in the XML catalogs. SGML definition
will generate fatal errors when loaded by an XML parser. 

Anything reachable from /etc/xml/catalog must be XML only. So html-4... just
can share things with xhtml1. W.r.t. using /usr/share/sgml for the XML catalog
this is the unfortunate result of SGML nutheads blocking XML from the LSB
standard a few years ago, so Red Hat had to keep them there instead of a
far more logical /usr/share/xml subtree !

W.r.t. XHTML 1.1 and SMIL 2.0, they are extensible languages, i.e. the basic
language defined in the DTDs are supposed to be extended with foreign elements
in different namespaces, which is actually something which doesn't work with
DTDs, so the usefulness of shipping those 2 gets very limited, as DTD based
validation will just fail in general (but Relax-NG or XSD schemas would work
better though there isn't good ways to reference them for catalog access from
the instances).

Please be very careful when trying to handle XML resources if you're competent
in SGML but not really aware of XML, this is a very different field with 
very different rules and specifications, this has bitten us in the past hard
and I don't want this to happen again.

Daniel (libxml2 author and member of W3C XML Core Working Group)


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