XML-Derived Markup Languages
16.1 Introduction
Throughout this book so far, we’ve discussed XML itself, the more common ways in which XML vocabularies are defined, and – predominately – how you can query XML documents using a variety of approaches, including XPath, XQuery, and SQL/XML.
In this chapter, we take a look at a number of specialized XML languages1 and express a few thoughts about the ways in which documents built using those vocabularies might be queried. In particular, we’ll see that at least some of these vocabularies might be more appropriately queried using languages other than those we’ve featured in this book.
We also look at the subject of how to discover things – such as web services, businesses from which you ...
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