Common functionality for all classes that are to be attributed. This trait must be extended by all classes for which the node properties such as parent and the attribute shorthand notation -> are desired.

Attribution of syntax trees in a functional style with attribute values cached so that each value is computed at most once.

Base support for attribution of syntax trees in a functional style. Includes circular attributes but needs to be augmented with basic attributes and parameterised attributes.

Support for dynamic attribution of syntax trees. Dynamic attributes definitions can be extended at runtime.

Attribution of syntax trees in a functional style with attribute values computed each time they are accessed.

Attribution of syntax trees in a functional style with attribute values cached so that each value is computed at most once.

Attribution of syntax trees in a functional style with attribute values computed each time they are accessed.