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Composite relationship and 0..1 multiplicity

Piotr Rzexniczak

Joined: Jan 26, 2011
Posts: 4

Can somebody explain me how the composite relationship and the 0..1 multiplicity can coexist together? Let's see at the attachment: EncapsulatedClassifier - Port relationship (from UML 2.1 spec):

  • EncapsulatedClassifier is a structured classifier
  • Port is a Property
  • Property is a part of StructuredClassifier
  • It means to me that Port can not exist without a EncapsulatedClassifier as its part

  • So - What the 0 in 0..1 multiplicity means? In my current understanding of this only 1 multiplicity would be correct...

    [Thumbnail for uml_cpomposite_01.png]

    Ove Lindström
    Ranch Hand

    Joined: Mar 10, 2008
    Posts: 326

    I agree with you that is looks a bit strange.

    The only explanation I can come up with is if we have all the Ports in a pool so that we can define all ports but not assign them to an EncapsulatedClassifyer. But it still looks strange.
    I agree. Here's the link:
    subject: Composite relationship and 0..1 multiplicity
    It's not a secret anymore!