Association and Property - some cases

Gallery
Tutorial
TRAIL: Webel's ultimate guide to Systems Modeling Language (v1) with MagicDraw/Cameo
Section
01:02: UML 101 for model-based systems engineering with SysML
Topic level
BASIC
UML keywords
Class
Association
Property
Association::ownedEnd
Association::memberEnd
Association::navigableOwnedEnd
Property::isNavigable()
AggregationKind
AggregationKind::composite
AggregationKind::none
AggregationKind::shared
MultiplicityElement
multiplicity
MultiplicityElement::/upper
MultiplicityElement::upperValue
MultiplicityElement::/lower
MultiplicityElement::lowerValue
LiteralUnlimitedNatural
Keywords
Slide kind
UML Class Diagram
All UML and SysML users should master the Association and end Property notations!
This diagram also shows the end Properties in the Class attributes compartment.
Click on the image to view it full size
Note also that a Property may also exist alone without an Association. Visit also:
SysMLv1: A part Property or reference Property is not necessarily a 'memberEnd' or 'ownedEnd' of an Association ('association' or 'owningAssociation'). But an Association always as at least 2 'memberEnd' Properties. [With some MagicDraw/Cameo tool tips.]
UML-2.5.1: 'A Property may represent an attribute of a Classifier, a memberEnd of an Association, or in some cases both simultaneously.'
Note that SysMLv1 has some additional rules and default multiplicities:
SysML1.7: 'SysML defines defaults for multiplicities on the ends of specific types of associations. A part or shared association has a default multiplicity of [0..1] on the black or white diamond end. A unidirectional association has a default multiplicity of 1 on its target end.'
The next slide shows the same Association cases but with UML Classifier owner dot notation activated and ownership indicated.
Up next
Association and Property - some cases - with dot notation and ownership indicators
Notes
[MODELLING, TIP]{INFORMATIVE} SysMLv1: MagicDraw/Cameo: Oh no, I lost my part or reference property? Where did it go? The Symbol Properties option for 'Show Association ends as Attributes' may help you find it!
Snippets (quotes/extracts)
  [UML-2.5.1] A LiteralUnlimitedNatural specifies a constant value of the PrimitiveType UnlimitedNatural.
  [UML-2.5.1] A LiteralUnlimitedNatural is shown either as a sequence of digits or as an asterisk (*), where an asterisk denotes unlimited.
  [UML-2.5.1] A Property may represent an attribute of a Classifier, a memberEnd of an Association, or in some cases both simultaneously.
  [SysML-1.7] SysML defines defaults for multiplicities on the ends of specific types of associations.
  [SysML-1.7] A part or shared association has a default multiplicity of [0..1] on the black or white diamond end. A unidirectional association has a default multiplicity of 1 on its target end.
  [UML-2.5.1] Aggregation type, navigability, and end ownership are separate concepts, each with their own explicit notation. Association ends owned by classes are always navigable, while those owned by associations may be navigable or not.
  [UML-2.5.1] Ownership of Association ends by an associated Classifier may be indicated graphically by a small filled circle, which for brevity we will term a dot.
  [UML-2.5.1] The dot is to be drawn integral to the graphic path of the line, at the point where it meets the Classifier, inserted between the end of the line and the side of the node representing the Classifier.
  [UML-2.5.1] The dot shows that the model includes a Property of the type represented by the Classifier touched by the dot. This Property is owned by the Classifier at the other end.
Visit also
Visit also (backlinks)
SysMLv1: Some invalid multiplicity examples with navigable and non-navigable Association ends. In Cameo Systems Modeler with validation.
SysMLv1: A part Property or reference Property is not necessarily a 'memberEnd' or 'ownedEnd' of an Association ('association' or 'owningAssociation'). But an Association always as at least 2 'memberEnd' Properties. [With some MagicDraw/Cameo tool tips.]
Related slides (includes other tutorials)
Block, Generalization, Association: Home entertainment system
Dependency vs Usage vs Association vs Connector
Association vs Connector - detailed
Related slides (backlinks, includes other tutorials)