SGML descended from IBM's Generalized Markup Language, which Charles Goldfarb, Edward Mosher, and Raymond Lorie developed in the 1960s.
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15 Facts About SGML
2.
SGML was extensively applied by the military, and the aerospace, technical reference, and industrial publishing industries.
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3.
An SGML document in which, for each document instance, there is an associated document type declaration to whose DTD that instance conforms.
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4.
SGML did this by a relatively simple default reference concrete syntax augmented with a large number of optional features that could be enabled in the SGML Declaration.
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5.
SGML provides an abstract syntax that can be implemented in many different types of concrete syntax.
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6.
SGML has features for reducing the number of characters required to mark up a document, which must be enabled in the SGML Declaration.
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7.
SGML has many features that defied convenient description with the popular formal automata theory and the contemporary parser technology of the 1980s and the 1990s.
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8.
SGML provides apparatus for linking to and annotating external non-SGML entities.
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9.
The SGML standard characterizes parsing as a state machine switching between recognition modes.
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10.
SGML uses the term validation for both recognition and generation.
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11.
SGML with an SGML declaration is, perhaps, a meta-metalanguage, since it is a metalanguage whose declaration mechanism is a metalanguage.
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12.
SGML has an abstract syntax implemented by many possible concrete syntaxes; however, this is not the same usage as in an abstract syntax tree and as in a concrete syntax tree.
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13.
W3C XML is a profile of SGML designed to ease the implementation of the parser compared to a full SGML parser, primarily for use on the World Wide Web.
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14.
For example, despite enabling SGML shortened tag forms, XML does not allow unclosed start or end tags.
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15.
Document markup languages defined using SGML are called "applications" by the standard; many pre-XML SGML applications were proprietary property of the organizations which developed them, and thus unavailable in the World Wide Web.
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