This article is part of the [[XQuery|XQuery Portal]].
In addition to the standard [https://www.w3.org/TR/xpath-functions-31/ XQuery Functions], BaseX comes with some hundred hundreds of additional functions, which are packaged in various modules.
The namespaces of the built-in modules are statically bound to their prefix. This means that they need not (but may) be declared in the query prolog.