LoadFunctionMap loads an initial function map.

NewModel creates an empty model.

NewModelFromFile creates a model from a .CONF file.

NewModelFromString creates a model from a string which contains model text.

Assertion represents an expression in a section of the model.

AssertionMap is the collection of assertions, can be "r", "p", "g", "e", "m".

FunctionMap represents the collection of Function.

Model represents the whole access control model.