[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: "XML is a subset of SGML" - True or False?
AndrewWatt2000@a... wrote: > My perception is that XML never was truly a "subset" of SGML. XML was developed as a subset of SGML. Most of the ISO working group which looked after SGML were also involved with the creation of XML (Clark, Kimber, Bosak, also Goldfarb, Peterson, me, and others). The correction for SGML came out before XML was finally put as a recommendation (AFAIR) so there never was a time when XML was not a true subset of SGML. Where there were differences, ISO8879 was corrected specifically to make sure that XML was indeed a subset. In fact, Charles Goldfarb even said at one stage "XML *is* the revision of SGML" (debate on the revision of ISO 8879 had started years before: XML was the embodyment of that). In fact, XML is explicitly part of ISO 8879, through non-normative Annex L: XML is used as an example of an "additional requirements" document--it cannot be normative because the ISO WG thought that W3C was an appropriate body to create and maintain an industry-lead profile of an ISO standard. >From the other way, you can see that there is a non-normative reference in XML to James Clark's document giving an SGML declaration to handle XML (in fact, this grew out of Appendix L). It is non-normative because you shouldn't need to know ISO 8879 to understand the XML spec. Some people want "non-normative" to somehow mean irrelevent material that can be discarded or discounted whenever convenient. XML Schemas do not alter anything w.r.t. XML status w.r.t. SGML. Rick Jelliffe *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/ ***************************************************************************
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