Identifiers are not fixed to one realization.
GUIDs are recommend. GUIDs are described in their own model. See GUIDModel (GUID.emx).
Identifier implementations can be found in external projects only.

Attribute
<Primitive Type> String	id

 id

Public <Primitive Type> String id

Eigenschaften:

Aggregation	None
Alias
Association
Association End
attributeName	id
Class	<Class> Identifier
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
isID	True
isTransient	False
isUnsettable	False
isVolatile	False
Keywords
Lower	1
Lower Value
Multiplicity	1
Name	id
Name Expression
Namespace	<Class> Identifier
Opposite
Owned Template Signature
Owner	<Class> Identifier
Owning Association
Owning Template Parameter
Qualified Name	identifier::Identifier::id
Stereotype	eAttribute
Template Parameter
Type	<Primitive Type> String
Upper	1
Upper Value
visibility	0 - Unspecified
Visibility	Public
xmlFeatureKind	0 - Unspecified
xmlName
xmlNamespace