19.11. Wrap-Up
In this chapter, we studied Extensible Markup Language and several of its related technologies. We began by discussing some basic XML terminology, introducing the concepts of markup, XML vocabularies and XML parsers (validating and nonvalidating). We then demonstrated how to describe and structure data in XML, illustrating these points with examples marking up an article and a business letter.
The chapter discussed the concept of an XML namespace. You learned that each namespace has a unique name that provides a means for document authors to unambiguously refer to elements with the same name (i.e., prevent naming collisions). We presented examples of defining two namespaces in the same document, as well as setting the default namespace ...
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