controller callable
A callable that accepts a Request instance and any optional parameters and returns a response
permission requirement
A set of permissions required to access a particular URL path. Permission requirements are specified by using the require_perm() decorator on a restricted controller callable
request validator
A function that checks a request to ensure it meets the specified permission requirement before calling a controller callable
root object
The starting object in the object traversal URL dispatch mechanism from which all path lookups are performed
URL dispatcher
An object that maps request paths to controller callables