UML/BPMN Metamodel
A type whose values have no identity (that is, they are pure values). DataTypes include primitive built-in types (such as integer and string) as well as enumeration types.
DataTypes include numbers, strings, and enumerated values.
DataTypes are passed by value and are immutable entities. DataTypes can be used as primitive classes.
In Modelio, DataTypes belong to a NameSpace.
Figure 208 : DataType (architecture_autodiagram)