Objects and Classes - Assigning Value - Expressions

3 important questions on Objects and Classes - Assigning Value - Expressions

You can use a literal or an indirect literal via an instance specification to assign a value to a property or slot as we have seen, but you can also use an OPAQUE EXPRESSION.

Wht is an Opaque Expression?

An opaque expression is an expression in a language that is opaque to UML. In this usage, “opaque” means “hidden” and that it is unparsable directly in UML.
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If necessary, you can specify the target language by preceding the opaque expression string with the language name displayed in.....?

braces ({}).

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In UML, most : ................. Are written as opaque expressions

In UML, most :
  • expressions
  • constraints
  • guard conditions
  • descriptions of behavior
  • and pseudocode


are written as opaque expressions.


As opaque expressions are not automatically parsed, constraints in UML are not always strictly in Boolean form as shown in Fig. 6.7
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