Re: XML - where's the beef?
That is an interesting interpretation of it. XML is not a standard for creating languages. It IS a markup language. As for HTML, it IS a subset of SGML. You cannot have an animal descended from a bird and call it a horse. It is still a bird.
Um, XML is still a metalanguage used for defining markup languages, which is what it shares with SGML. And this thing about HTML being a descendant of SGML is historical revision. Tim Berners-Lee developed HTML on its own. Only afterward did people notice the similarities and begin to apply the same structural principles.
So, if HTML is a specific document type, then its parent, SGML, is also a document type. So is XML. That is what the element <!DOCTYPE is declaring.
HTML is a specific tag set. It is limited. XML and SGML are not limited tag sets; they are metalanguages (languages use to create languages). That's the point Michael was making. Given that he worked with GML (the predecessor to SGML created by Charles Goldfarb) and is involved in an XML initiative at IBM, I think he has a pretty good idea of what XML is and isn't.
Bill Burns, Senior Technical Consultant, Scriptorium Publishing
The WebWorks Publisher Cookbook now available
http://www.scriptorium.com/books/wwpcookbook.html
bburns -at- scriptorium -dot- com - 208-484-4459
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References:
Re: XML - where's the beef?: From: mpriestl
Re: XML - where's the beef?: From: Scott Turner
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