All RESTXQ [[XQuery 3.0#Annotations|annotations]] are assigned to the {{Code|http://exquery.org/ns/restxq}} namespace, which is statically bound to the {{Code|restxq}} prefix. A ''Resource Function'' is an XQuery function that has been marked up with RESTXQ annotations. When an HTTP request comes in, a resource function will be invoked that matches the constraints indicated by its annotations.
Whenever a RESTXQ URL is requested, the [[Options#RESTXQPATH|RESTXQPATH]] module directory and its sub-directories will be scanned for modules functions with REST annotations. RESTful functions may occur in library modules (Extension: {{Code|*.xqm}}) and (since {{Version|7.7}}) main modules (Extension: {{Code|*.xq}}). Each function module will be cached and parsed again when its timestamp changes.
A simple RESTXQ module is shown below, it is part of a clean installation and available at http://localhost:8984/restxq/ .