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XML is an application profile or restricted form of SGML, the Standard Generalized Markup Language.
By construction, XML documents are conforming SGML documents." "XML is primarily intended to meet the requirements of large-scale Web content providers for industry-specific markup, vendor-neutral data exchange, media-independent publishing, one-on-one marketing, workflow management in collaborative authoring environments, and the processing of Web documents by intelligent clients.
In addition, Web Collections can be expressed inside HTML documents or on their own. Some of the anticipated applications of Web Collections include Web Maps, HTML Email Threading, PIM functions, scheduling, content labeling, and distributed authoring." ["work in progress"] Netscape Communications announced a new proposed XML application.
In addition they are stylistically similar to HTML to enable easy authoring. According to the notice on the Netscape Developer's page: "The Meta Content Framework, or MCF, provides a standard way to describe files or collections of information. According to the introduction, XML-Data "describes an XML vocabulary for schemas, that is, for defining and documenting object classes.
One immediate implication of these ideas is a substantive part of the functionalities of XML document types can now be described using the XML instance syntax itself, rather than DTD syntax.
The next version of 'HTML' is expected to be reformulated as an XML application, so that it will be based upon XML rather than upon SGML.
As of December 1998, 'Voyager' was the W3C code name for HTML reformulated as an application of XML.
The NOTE also includes an SGML declaration which describes the constraints of XML applicable to an SGML parser. It is also to be expected that some early XML/XLink/XSL applications may be merely demonstrations, toys, proof-of-concept applications; still others might be naive or ill conceived.
[local archive copy] [This paragraph is superseded by the technical NOTE 'NOTE-sgml-xml' referenced immediately above.] Features in SGML but not in XML include [as of November 5, 1996]: "Tag omission; The CONCUR, LINK, DATATAG, and SHORTREF features; The "&" connector in content models; Inclusions and exclusions in content models; CURRENT, CONREF, NAME, NAMES, NUMBER, NUMBERS, NUTOKEN, and NUTOKENS declarations for attributes; The NET construct; Abstract syntax; Capacities and quantities; Comments appearing within other markup declarations; Public Identifiers; Omission of quotes on attribute values." For a more recent/complete comparison of features, see the relevant section in the language specification, or "What else has changed between SGML and XML? As of December 1997, the current and former members of the XML WG are: "Jon Bosak, Sun (Chair); James Clark (Technical Lead); Tim Bray, Textuality and Netscape (XML Co-editor); Jean Paoli, Microsoft (XML Co-editor); C. It may be necessary to regard some of these ideas 'in draft' like some of the specifications documents themselves. [June 30, 1999] A 'TEI Lite DTD in XML' was made available from the TEI Web site.
It is also expected to find use in certain metadata applications.