Summary
In this hour, you were exposed to some of the additional languages that are constructed using markup tags. If you explored some of the URLs, you probably encountered other languages that are currently being proposed, developed, or implemented.
You've learned a great deal in this book, and now you're ready to use XML productively. As this last hour should have made clear, XML is a very powerful language that can be used in many different contexts. RELML and HRMML are simply sets of XML DTDs that define the forms of the data. Even the languages that weren't defined using XML—VML, VRML, and VoxML—are constructed using the same principles as XML. Because it's a data markup language and everything is data, it's hard to think of an area where ...
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