Background: XML in Web Architecture
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Web Architecture = Data
Formats,
Protocols, and
Naming/Addressing Syntax;
originally: HTML, HTTP, URIs
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Data formats and protocols evolve; URI syntax does not
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HTML was layered on SGML syntax
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XML constrains SGML so that parsing does not rely on a DTD
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XML vocabularies (HTML, SVG, RDF, MathML, SMIL, ...) are grounded in URI
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