Contains classes/types representing parts of the UML metamodel.
||Defines a semantic relationsip between two or more Classifiers.|
||Endpoint of an Association, which connects the association to a Classifier.|
||Declares a collection of Features, such as attributes, methods and operations.|
||A Feature is a property, like Operation or Attribute, which is encapsulated within another entity, such as an Interface, a Class or a DataType.|
||A model element which may participate in a generalization relationship.|
||Named entity in a model.|
||Part of a model in which each name has a unique meaning.|