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GivenName : is the first given name of a director, producer or cast. familyName : is the family name (in Western cultures, normally the last name) of a director, producer or cast. 7 Or a DTD. 3 XML-Based Markup Languages 15 These semantic definitions are human-readable, not machinereadable. The Semantic Web s is an attempt to make semantics machine-readable (see Chapters 4 and 18). The Semantic Web is still very much a work in progress - in the meantime, let's look at some XML-based markup languages that are already widely used.
But HTML, with its tags for purely formatting markup, such as italics and boldface, has definitely crossed over that line into presentation markup. Fortunately, both of these differences can be resolved. Most HTML can be turned into valid XML (and not lose its validity as HTML) with some simple cleanup, such as making sure all start tags have a matching end tag. And XML is a markup language (or a language for markup languages) - you can use XML to represent any kind of markup, semantic or representation (or syntactic or anything else).
3. We have a Schema that describes rules for the data (such as order, type, scooping, a n d legal values). A well-thought-out element name does add some meaning for a human reader with some knowledge of the data and/or the domain. But without a defined vocabulary, it's only a very little meaning, and of course that meaning can't be machine-processed. 2 Adding Markup to Data 13 Have we succeeded in representing the meaning of the data? Somewhat. We know a lot more about the data, but we still don't know its meaning.