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A Class has four mandatory compartments: attributes, operations, receptions ... and internal structure ... A Class may also have optional compartments as described for Classifiers in general

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Class compartments
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Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Class
Classifier
symbol
compartment
attribute
attributes compartment
Operation
operations compartment
Reception
receptions compartment
internal structure compartment
optional compartment
A Class is shown using the Classifier symbol. As Class is the most widely used Classifier, no keyword is needed to indicate that the metaclass is Class.
Full quote
A Class has four mandatory compartments: attributes, operations, receptions ... and internal structure ... A Class may also have optional compartments as described for Classifiers in general ...
Next snippet
The operations compartment of a Class contains notation for its ownedOperations ...
Related snippets
A Class is shown using the Classifier symbol. As Class is the most widely used Classifier, no keyword is needed to indicate that the metaclass is Class.
Related snippets (backlinks)
A compartment with the label “receptions” may appear as part of a block definition to show signal receptions. The “«signal»” keyword is optional in this compartment.
The operations compartment of a Class contains notation for its ownedOperations ...
The receptions compartment contains ownedReceptions ...
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