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A comment on Apple TV Markup Language. Parent comment

Re:Apple TV Markup Language by danieldk on Thursday September 10, 2015 @02:24PM (#10199668)
It's not like HTML except for being XML which looks a lot like SGML.

XML does not only look a lot like SGML, it is a proper subset of SGML:

XML is an application profile or restricted form of SGML, the Standard Generalized Markup Language [ISO 8879]. By construction, XML documents are conforming SGML documents.

http://www.w3.org/TR/xml11/

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Re:Apple TV Markup Language by pluma on Thursday September 10, 2015 @08:31PM (#10201362)
Unlike HTML, btw, which started out as a loose subset of SGML but has abandoned the goal of SGML compatibility in favour of conceptual simplicity.
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Re:Apple TV Markup Language by dunham on Thursday September 10, 2015 @04:02PM (#10200232)
Interesting, I didn't realize they claimed XML was an SGML subset. I thought you couldn't express XML empty tags in an SGML DTD.
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