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XPath Functions 

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You can use XML Path Language (Xpath) functions to refine XPath queries and enhance the programming power and flexibility of XPath.

The functions are divided into the following groups.

Node-Set

Takes a node-set argument, returns a node-set, or returns/provides information about a particular node within a node-set.

String

Performs evaluations, formatting, and manipulation on string arguments.

Boolean

Evaluates the argument expressions to obtain a Boolean result.

Number

Evaluates the argument expressions to obtain a numeric result.

Microsoft XPath Extension Functions

Microsoft extension functions to XPath that provide the ability to select nodes by XSD type. Also includes string comparison, number comparison, and date/time conversion functions.

Each function in the function library is specified using a function prototype that provides the return type, function name, and argument type. If an argument type is followed by a question mark, the argument is optional; otherwise, the argument is required. Function names are case-sensitive.