Chapter 4. Functions and Modules
Introduction
In any programming language, functions are one of the most powerful tools available to a developer. XQuery provides both a large built-in function library and the ability to create your own functions. XQuery also allows implementations to interoperate with externally defined functions from other languages.
Every XQuery function has a qualified name, zero or more typed arguments, and a return type. Together, these constitute a function's signature. User-defined functions also have a function body (an XQuery expression that defines the function's behavior).
This chapter finishes laying the foundation of XQuery by describing how to invoke built-in and external functions and how to create and invoke user-defined ...
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