By Marshall C. Yovits

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Does it preserve the semantic meaning of the model? For this example it is possible to show that these properties are true: the transformation process terminates because each rule application reduces the number of Property instances by at least one – so there can only be finitely many rule applications. The rule does not create classes, types or generalisations, and does not change class nor type names, so the invariants concerning class name uniqueness, type name uniqueness and single inheritance are clearly preserved.

1, every student has a name, which is a string. Operations of a class represent computed properties of instances of the class (in the case of query, instance scope operations), or computed properties independent of particular instances (query, static operations), or represent updates to the state of instances. Query operations must have return types, an example is possibleValues () : Set (Integer ) in Fig. 4. 31 32 Agile Model-Based Development Using UML-RSDS Associations between classes (or between a class and itself) denote the links which exist between instances of one class and another.

A query (non-updating) operation has the constraint {query} written beside it in UML class diagrams. Query operations must have a return type. Associations, denoted by lines between classes (including between a class and itself, in the case of a reflexive association). Each end of the line can have a rolename, and both ends should have a multiplicity. In UML-RSDS the default is a unidirectional association (navigated from the source class – at the end without the rolename – to the target class – the end with the rolename), but bidirectional associations with rolenames at both ends can be defined.

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