A.1 A Quick Introduction to XML
These days, almost everyone has at least heard of XML, and certainly everyone has used it, though often unknowingly. If you’ve seen the source code of a web page, you already know what XML looks like, because XHTML, the markup language used on the Web today, is one of the subspecies of XML (more precisely, an XML vocabulary). SVG is another such vocabulary.
XML is a standardized way to record structured information in plain text. Its biggest advantage is that it is easy to parse for computers and yet quite understandable for humans. Unlike most other computer-related concepts that are, usually, as complex as you think they are (or more), XML is an unbelievably simple thing. So simple, in fact, that I will now explain ...
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