2. XML, SGML and HTML: a historical perspective 2.1 XML and SGML XML is directly derived from SGML (Standard Generalized Markup Language), the generic markup language conceived in the early 1980s and ...

SgmlReader - Convert (almost) any HTML to valid XML SgmlReader is a versatile C# .NET library written by Chris Lovett for parsing HTML/SGML files using the XmlReader API. A command line utility is ...

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Unlike HTML and XML, SGML will probably never gain widespread acceptance on the Internet, simply because it was never designed or optimized for the demands of a network protocol.

In contrast, widespread use of HTML exemplified the desirability of simplicity in XML standardization. The latter issue and HTML's user market largely explain discontinuity in SGML-XML succession.

Unlike SGML, the XML DTD was always optional, because the framers of XML knew there was enormous value in documents that were merely well-formed, even if not valid with respect to a DTD.