Variables, Expressions, and Parameters

The last chapter focused on how to create conditional content using XSLT, and along the way we introduced XPath expressions . XPath expressions are simple bits of code that a processor evaluates to get a value. XPath expressions are used by XSLT a lot, but other languages such as XPointer also use them. In the last chapter you learned about the four basic data types in XPath: booleans, numbers, strings, and node sets. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.