Architecting and designing : UML 2.5 : Relationships : ElementGroup to Element
  
ElementGroup to Element
An ElementGroup is a comment aimed at a grouping of Model Elements.
A Comment can be annotated as an ElementGroup through a stereotype property.
You can assign an ElementGroup comment to model elements through the ElementGroup to Element relationship.
Relates
The ElementGroup to Element relationship can be drawn like this:
From
To
Comment (stereotype ElementGroup)
Any Model Element (or group of Model Elements)
See also
Association
Dependency
Realization
Collaboration Property to Part
Component Provides (Realizes) Interface
Component Requires (Uses) Interface
Port Provides (Realizes) Interface
Port Requires (Uses) Interface
Comment to AnnotatedElement
Constraint to ConstrainedElement
Connector
Instance Specification Relationships
Generalization
Package Containment
Package Import
Substitution
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Relationships