okay please help i do no have that much knowledge of OCL written constraints. in the picture below i am trying to put a constraint on class J that its attribute should be true after it but it is giving me an error Parsing Error: 1:1:4 “inv:” misplaced construct(s). i don't know how to solve this error and in the next class anonymous key=".0" i am also trying to put up a constraint that if the attribute of J class 'State' is true then this class be visible please help me if anyone knows about ocl constraints and also guide me for state machines as well thank you.
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(I'm not familiar with RSA except in so far as what I can infer from 10 year obsolete Eclipse OCL behaviour.)
OCL by itself is almost useless since it has no models to operate on; it needs to be embedded within a model provider.
One such provider is OCL-in-UML where an Essential OCL expression is encapsulated by an OpaqueExpression. self.state=true or indeed just self.state would be a plausible Essential OCL expression for a Boolean-valued Constraint / invariant.
An alternative provider is a Complete OCL document which complements a metamodel.
You have used the Complete OCL syntax where you should have used Essential OCL.
Ed Willink
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