Introducing the Extensible Markup Language (XML) / Bryan, Extending Your Markup / Bergholz, A Survey of XML Standards / Ogbuji, XML Schema Tutorial / W3
Extensible Markup Language (XML) is a "subset of Standardized General Markup Language (SGML)" made to carry & store data. It is more flexible than HTML because the user can define their own tags, which makes it easier to share data across different languages & fields. Users don't need a particular version of software to create documents in XML structure. XML governs the structure of a data & not, as HTML does, what that data will look like. XML is expressed in documents which are made up of entities which are made of elements. Elements are made of attributes. For some reason, this breakdown of the structure of XML documents make me think of second grade grammar lessons when we learned sentence diagramming. These articles (except W3) were difficult to get through because they assume the reader has some experience/background with SGML. I'll have to re-read & go through the tutorials a few more times.
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