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OCL cannot find feature in link target constraint body [message #540300]

Tue, 15 June 2010 14:53

Robert Wloch

Messages: 109
Registered: July 2009

Senior Member

Hi

I need some help using OCL in a GMF target link constraint following this guide here.

In my case I have an EClass "Type" with an EAttribute "interface". Another EClass "Class" inherites "Type" and provides an additional containment EReference "superTypes" (0..*).

Now, specifying "self.interface" in the body of my link target constraint does work fine. However, using "self.superTypes->isEmpty()" I get this error:

Invalid expression body 'if oppositeEnd.interface then
  self.interface
else
  not self.interface and self.superTypes.size() < 1
endif'. Cause: Unrecognized variable: (superTypes)

As I said, as soon as I remove " and self.superTypes.size() < 1" it is working and yes, I checked that my "Class" has a feature "superTypes".

Can anybody help me here?

Cheers
Rob

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