public interface Faceted

Indicates that an object can provide various "facets," which are specific distinct interfaces that can represent a portion of the object.

For example, an instance of an Entity may have a facet for accessing its inventory (if it contains an inventory) or a facet for accessing its health (if it has health).

Facets are referred to by their interface or abstract class and it is dependent on the implementation of the object specifying this interface to return the most applicable implementation. However, in many cases, such an implementation may not apply or it has not been implemented so a request for a facet may return null.