UML Types in the Acceleo EOL interpreter.

[JRSS3]

Hi

This is a very basic question, I have started to work with EOL and EGX and for testing queries in UML models I tried to use the Acceleo EOL interpreter. I am able to execute queries selecting the elements in the UML editor and I get the types of the model elements, even I am able to filter the elements using the name of the types for example, self.select(element | element.type.name = "Class"). But if try to filter using an UML model type, self.select( element | element.isTypeOf(Class) or self.select( element | element.isTypeOf(UML!Class) I am only getting an error that Class or UML is not recognized as a model, variable or type. What is the error?

Thanks

Jose

[kolovos]

Hi Jose,

I tried this with Epsilon 2.8 and it worked as expected (see below). Could you please provide a bit more detail about your setup?

Thanks,
Dimitris

[kolovos]

On a related note, If you have multiple metamodels containing a Class type in your Eclipse workbench you may see warnings like the one below in the console.

Warning: The type 'Class' is ambiguous and could refer to any of the following: 'Model!sysml::Class' 'Model!uml::Class'. The type 'Model!sysml::Class' has been assumed. (null@1:0)

In this case you can specify that you are referring to the UML Class type by using uml::Class as shown below.

return self.isTypeOf(uml::Class);

[JRSS3]

Thank you Dimitri for the fast answer, I have to review the exact scenario of the failure. After your first email it was working during a while, I am testing a C generator, but now is failing once again. I send you the screenshot. I have tested with the uml:: prefix but keeps failing.

[kolovos]

I tried to reproduce this and the only case when I get this error is when the first selected element in the editor is not a model element but the resource of the model instead. Could this be the issue in your case?

[JRSS3]

Hi Dimitri

I kept with my tests and I found that the issue is related with the model used as selected input. In the same eclipse configuration I have repeated the test with my model that has several profiles applied and with the one that comes as an UML programming example, as getting started. I get the error with my model but works fine with the example, the same query, "return self.ownedElement.select(element | element.isTypeOf(uml::Class));" applied to the Model element of each of them. With the interpreter open and changing the selection between the 2 models. The tests are done with the last stable version of the Papyrus Designer, 7.1, base on eclipse 2025-06, installing the epsilon 2.8.

Best regards
Jose

[kolovos]

Thanks for the update. Could you please attach a minimal model/project that I can use to reproduce this?

[JRSS3]

Hi

Dimitri it is easy, in a 2025-06 Papyrus Designer installation you have to create the HelloWorldOO example of a C++ code generation example with no transformations. Select the model element in a UML editor view and launch in the interpreter the query "return self.packagedElement.select(c | Class);". Attached is an screenshot of the scenario.return self.packagedElement.select(c | Class);

Best regards

Jose

[kolovos]

I downloaded Papyrus Desktop 2025-26 and installed Acceleo and Epsilon on top of it but I'm not sure how to create a "HelloWorldOO example of a C++ code generation". If you could provide step-by-step instructions or a zipped copy of your project, that'd be very helpful.

[kolovos]

Please ignore this message. I've now installed Papyrus Designer and I can create the HelloWorldOO example.

[kolovos]

This seems to be due to a mismatch between the way the tree-based UML editor loads the model and the assumptions that Epsilon's InMemoryEmfModel makes. If you open the UML model with Exeed instead (right click on the model -> Open With -> Other... -> Exeed Editor) it should work as expected (see below).

[JRSS3]

I have tried with my model and Exeed and I got the same error. I will keep on investigating the error scenario. The thing that I know is that sometimes works fine with the UML editor, but I could not find exactly what is the steps required to make it work. It has to be related with the load of the model.

[kolovos]

I've pushed a fix for the underlying issue so if you try with the latest interim version it should work.

[JRSS3]

Thank you, Dimitri, it is fixed. I am using the framework case developing a C code generator for embedded system with RTOS to developped a real commercial product.. I have seen another issue in the debugger but I have to reproduce the issue properly.