Hacking XPath 2.0

[Nytro]

Hacking XPath 2.0

Introducing XPath

XPath 1.0 is a well-supported and fairly old query language for selecting nodes in an XML document

and returning a computed value from the selected nodes. There are plenty of libraries implementing

full or basic support for XPath 1.0 in a huge variety of languages including Java, C/C++, Python, C#,

Haskell, JavaScript and Perl.

Using XPath 1.0 you can write simplistic queries that filter nodes within a single specified XML

document. For example, given the following XML document shown below it would be trivial to check

if a user existed and authenticate them based upon a supplied username and password.

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