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The XML Meta-Language

The eXtensible Markup Language (XML) is a W3C standard (, ) for defining markup-based data representation languages. With the recent addition of the XML Schema facility (, ), XML-derived languages can be both processed and reified as XML.
XML--and consequently XML-based languages, are well-formed with respect to the XML structure definition. The notion of well-formedness refers to its acception in predicate logic. Well-formedness obviously facilitates (or even enables) an automated and uniform parsing of the language. Character representation in XML uses by default the Unicode standard. This, as well the elements above make of XML the lingua franca of data representation.