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Meshing ACCELEO and Xtext [message #901948]

Wed, 15 August 2012 05:08

Eclipse User

I am in the middle of an ACCELEO Transformation aimed at producing code (i.e. Java) from an input UML model.

Some elements of this UML model (i.e. Activities Opaque actions) contain some text which is conform to an Xtext grammar and I'd like to get the equivalent AST Ecore representation in the ACCELEO transformation.

To this end I have developed a Java class with a method which takes as input a string, containing the DSL excerpt, and produces an ECORE model conform to it (see http://www.eclipse.org/forums/index.php/m/901947/#msg_901947 for further details). I have tested it in a separate Java application and it seems it works properly.

I have therefore written a simple ACCELEO module (i.e. getDSLModel) wrapping that java class and enabling me to get the Ecore model from the DSL textual representation.

Suppose my DSL (and the equivalent ECORE) consist of a root element named DSLModel containing a (0..*) number of DSLStatements (this is a simplification).
When in ACCELEO I invoke the wrapper from a string, containing a correct dsl script, i have noticed it correctly returns a ModelImpl

['statement1;statement2'.getDSLModel()/]

so the Java service and the XText parse is working.

However if I try to get the model statements, i.e.:

['statement1;statement2'.getDSLModel().statements/]

it returns an **"invalid"** string. So I can't use it in a for loop

I have therefore tried to call the eAllContents() ocl service from the model instance i.e.:

['statement1;statement2'.getDSLModel().eAllContents()/]

and it actually returns the list of statements. I do not understand why the features of the Ecore entities returned from the Xtext parser are not working properly.

Any help would be very appreciated! Thank you

here is the Java service which turns a string into a instance of my DSL model (ECORE AST). I have tested it with an independent Java application and it works fine!

     public class GetDSLModel {
	 public DSLModel getDSLModel(String expression){	
		DSLStandaloneSetupGenerated dslsas = new DSLStandaloneSetupGenerated();
		Injector injector = dslsas.createInjectorAndDoEMFRegistration();
		XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
		resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
		Resource resource = resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
		InputStream in = new ByteArrayInputStream(expression.getBytes());
		try {
			resource.load(in, resourceSet.getLoadOptions());
			DSLModel model = (DSLModel) resource.getContents().get(0);
			return model;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
		
	}
	
    }

Now I need the AST in the main ACCELEO (UML2Text) transformation thus here is the Acceleo wrapper


     [query public getDSLModel(str:String): DSLModel =  (invoke('sfg.baleno.src.mloaders.GetDSLModel','getDSLModel(java.lang.String)',Sequence{str})).oclAsType(DSLModel)/]

here is what I get if run it

      input: ['statement1;statement2'.getDSLModel()/]
      output: mypackage.dsl.impl.DSLModelImpl@a1c7a

      input: ['statement1;statement2'.getDSLModel().statements/]  (Syntactically VALID)
      output: invalid

      input: ['statement1;statement2'.getDSLModel().eAllContents()/]
      output: mypackage.dsl.impl.DSLStatement@e53202 (......

[Updated on: Wed, 15 August 2012 12:15] by Moderator

Re: Meshing ACCELEO and Xtext [message #901963 is a reply to message #901948]

Wed, 15 August 2012 06:39

Eclipse User

Hi

It certainly can work, but your details are a little vague so it's
difficult to help.

You could debug why the invalid is created, or perhaps just do a resolve
all proxies before starting and check for deep errors (errors in any
Resource.errors).

Regards

Ed Willink

On 15/08/2012 10:08, Andrea Sindico wrote:
> I am in the middle of an ACCELEO Transformation aimed at producing
> code (i.e. Java) from an input UML model.
> Some elements of this UML model (i.e. Activities Opaque actions)
> contain some text which is conform to an Xtext grammar and I'd like to
> get the equivalent AST Ecore representation in the ACCELEO
> transformation.
> To this end I have developed a Java class with a method which takes as
> input a string, containing the DSL excerpt, and produces an ECORE
> model conform to it (see
> http://www.eclipse.org/forums/index.php/m/901947/#msg_901947 for
> further details)
>
> I have therefore written a simple ACCELEO module wrapping that java
> class and enabling me to get the Ecore model from the DSL textual
> representation.
> Suppose my DSL (and the equivalent ECORE) consist of a root element
> named MODEL containing a (0..*) number of STATEMENTs (this is a
> simplification). When in ACCELEO I invoke the wrapper from a string i
> have noticed it correctly returns a ModelImpl so the Java service and
> the XText parse is working. However if I try to get the model
> statements it returns an "invalid" strings. I have therefore tried to
> call the eAllContents() ocl service from the model instance and it
> actually returns the list of statements. I do not understand why the
> features of the Ecore entities returned from the Xtext parser are not
> working properly.
> Any help would be very appreciated! Thank you

Re: Meshing ACCELEO and Xtext [message #902029 is a reply to message #901963]

Wed, 15 August 2012 10:40

Eclipse User

Hi Ed, thank you for your answer. What do you mean with "just do a resolve all proxies before starting" I admit I didn't get it Sad

Re: Meshing ACCELEO and Xtext [message #902051 is a reply to message #902029]

Wed, 15 August 2012 12:24

Eclipse User

Ed I have have added more details to my question. I hope it helps to understand what is not working. It seems the problem relates to the passage of a meta-model element implementation to its ACCELEO representation but I am actually not that sure. It is a bit frustrating as I was very close to my aim, I thought the hardest part was the on the fly transformation of a string into a model Smile

Re: Meshing ACCELEO and Xtext [message #902072 is a reply to message #902029]

Wed, 15 August 2012 14:04

Eclipse User

On 15/08/2012 15:40, Andrea Sindico wrote:
> Hi Ed, thank you for your answer. What do you mean with "just do a
> resolve all proxies before starting" I admit I didn't get it :(
EcoreUtil.resolveAll()

Re: Meshing ACCELEO and Xtext [message #902084 is a reply to message #902072]

Wed, 15 August 2012 15:01

Eclipse User

Ok I have changed the Java service this way:

 public class GetDSLModel {
	 public DSLModel getDSLModel(String expression){	
		DSLStandaloneSetupGenerated dslsas = new DSLStandaloneSetupGenerated();
		Injector injector = dslsas.createInjectorAndDoEMFRegistration();
		XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
		resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
		EcoreUtil.resolveAll(resourceSet);
                Resource resource = resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
		InputStream in = new ByteArrayInputStream(expression.getBytes());
		try {
			resource.load(in, resourceSet.getLoadOptions());
			DSLModel model = (DSLModel) resource.getContents().get(0);
			EcoreUtil.resolveAll(model);
                        return model;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
		
	}
	
    }

It still works when invoked from another Java class but it still outputs invalid in Acceleo

Re: Meshing ACCELEO and Xtext [message #902092 is a reply to message #902084]

Wed, 15 August 2012 15:25

Eclipse User

Hi

Why don't you call DSLStandaloneSetup.doSetup() ?

Regards

Ed Willink

On 15/08/2012 20:01, Andrea Sindico wrote:
> Ok I have changed the Java service this way:
>
> public class GetDSLModel {
> public DSLModel getDSLModel(String expression){
> DSLStandaloneSetupGenerated dslsas = new
> DSLStandaloneSetupGenerated();
> Injector injector = dslsas.createInjectorAndDoEMFRegistration();
> XtextResourceSet resourceSet =
> injector.getInstance(XtextResourceSet.class);
> resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL,
> Boolean.TRUE);
> EcoreUtil.resolveAll(resourceSet);
> Resource resource =
> resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
> InputStream in = new ByteArrayInputStream(expression.getBytes());
> try {
> resource.load(in, resourceSet.getLoadOptions());
> DSLModel model = (DSLModel) resource.getContents().get(0);
> EcoreUtil.resolveAll(model);
> return model;
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> return null;
>
> }
>
> }
>
>
> It still works when invoked from another Java class but it still
> outputs invalid in Acceleo

Re: Meshing ACCELEO and Xtext [message #902111 is a reply to message #902092]

Wed, 15 August 2012 18:02

Eclipse User

Ok now the Java code looks like this

 public class GetDSLModel {
	 public DSLModel getDSLModel(String expression){
                DSLStandaloneSetup.doSetup();	
		DSLStandaloneSetupGenerated dslsas = new DSLStandaloneSetupGenerated();
		Injector injector = dslsas.createInjectorAndDoEMFRegistration();
		XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
		resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
		EcoreUtil.resolveAll(resourceSet);
                Resource resource = resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
		InputStream in = new ByteArrayInputStream(expression.getBytes());
		try {
			resource.load(in, resourceSet.getLoadOptions());
			DSLModel model = (DSLModel) resource.getContents().get(0);
			EcoreUtil.resolveAll(model);
                        return model;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
		
	}
	
    }

unfortunally it behaves the same. It works when executed from another java class but "it doesn't" when invoked from Acceleo

Re: Meshing ACCELEO and Xtext [message #902122 is a reply to message #902111]

Thu, 16 August 2012 00:39

Eclipse User

Hi

DSLStandaloneSetup.doSetup() is all that you need and you just put it
where the comments in Acceleo say to register your packages.

Regards

Ed Willink

On 15/08/2012 23:02, Andrea Sindico wrote:
> Ok now the Java code looks like this
>
>
> public class GetDSLModel {
> public DSLModel getDSLModel(String expression){
> DSLStandaloneSetup.doSetup();
> DSLStandaloneSetupGenerated dslsas = new
> DSLStandaloneSetupGenerated();
> Injector injector = dslsas.createInjectorAndDoEMFRegistration();
> XtextResourceSet resourceSet =
> injector.getInstance(XtextResourceSet.class);
> resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL,
> Boolean.TRUE);
> EcoreUtil.resolveAll(resourceSet);
> Resource resource =
> resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
> InputStream in = new ByteArrayInputStream(expression.getBytes());
> try {
> resource.load(in, resourceSet.getLoadOptions());
> DSLModel model = (DSLModel) resource.getContents().get(0);
> EcoreUtil.resolveAll(model);
> return model;
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> return null;
>
> }
>
> }
>
>
> unfortunally it behaves the same. It works when executed from another
> java class but "it doesn't" when invoked from Acceleo

Re: Meshing ACCELEO and Xtext [message #902130 is a reply to message #902122]

Thu, 16 August 2012 01:47

Eclipse User

Hi Ed, where are those comments in Acceleo? And how should I invoke the StandaloneSetup.doSetup() in Acceleo, by means of a different wrapper?
Anyway I have also tried to rearrange the code this way:

 public class GetDSLModel {
	 public DSLModel getDSLModel(String expression){
                DSLStandaloneSetup.doSetup();	
		ResourceSet resourceSet = new ResourceSetImpl();
		resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
		EcoreUtil.resolveAll(resourceSet);
                Resource resource = resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
		InputStream in = new ByteArrayInputStream(expression.getBytes());
		try {
			resource.load(in, resourceSet.getLoadOptions());
			DSLModel model = (DSLModel) resource.getContents().get(0);
			EcoreUtil.resolveAll(model);
                        return model;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
		
	}
	
    }

different code same behavior. It works fine when invoked from a different java class but when invoked from Acceleo, though I see it returns correct ClassImpl instances they are apparently not properly turned into the equivalent ECORE entities.

thank you for your kind help

[Updated on: Thu, 16 August 2012 01:49] by Moderator

Re: Meshing ACCELEO and Xtext [message #902139 is a reply to message #902130]

Thu, 16 August 2012 02:16

Eclipse User

<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Hi 
 
You provide one erroneous class and expect help. 
 
I've no idea what it does, but it seems all wrong so just delete
it. Why would you expect your ResourceSet to coexist with
Acceleo's and Xtext's? 
 
Acceleo generates a Java file for your main template. That file is
full of comments about how to make it work standalone. Try reading
them. 
 
From the Acceleo documentation: 
 
<h3>Package registration</h3>
 You need to register the package that contains your
classifiers, in order to use it inside of your generator. To do
this, have a look at the method named "registerPackages" in the
Java launcher generated next to your main module. You need to
add the following piece of code: 
<pre> /**
* @generated NOT
*/
public void registerPackages(ResourceSet resourceSet) {
super.registerPackages(resourceSet);
if (!isInWorkspace(MyPackage.class)) {
resourceSet.getPackageRegistry().put(MyPackage.eINSTANCE.getNsURI(), MyPackage.eINSTANCE);
}
}
</pre>
 The "@generated NOT" tag in the Javadoc is necessary to
prevent the removal of your modification. Once the package is
registered, Acceleo can use EMF to load your input model. If
this does not work, you will see an error message stating that
EMF cannot find the package with the uri "<metamodel_uri>". </metamodel_uri>
This is where you can put DSLStandaloneSetup.doSetup(); 
 
If you're paranoid about double initialization you can do: 
 
 @Override 
 public void initialize(EObject element, File folder, List<?
extends Object> arguments) throws IOException { 
 preInitialize(); 
 super.initialize(element, folder, arguments); 
 } 
 
 @Override 
 public void initialize(URI modelURI, File folder,
List<?> arguments) throws IOException { 
 preInitialize(); 
 super.initialize(modelURI, folder, arguments); 
 } 
 
 protected void preInitialize() { 
 DSLStandaloneSetup.doSetup(); 
 } 
 
or 
 
 static { 
 if (!EMFPlugin.IS_ECLIPSE_RUNNING) { 
 DSLStandaloneSetup.doSetup(); 
 } 
 } 
 
 Regards 
 
 Ed Willink 
 
On 16/08/2012 06:47, Andrea Sindico wrote: 
</div>
<blockquote cite="mid:k0i1i2$iv5$1@xxxxxxxxe.org" type="cite">Hi
Ed, where are those comments in Acceleo? And how should I invoke
the StandaloneSetup.doSetup() in Acceleo, by means of a different
wrapper?
 
Anyway I have also tried to rearrange the code this way:
 
 
 
public class GetDSLModel {
 
 public DSLModel getDSLModel(String expression){
 
 DSLStandaloneSetup.doSetup(); 
 ResourceSet resourceSet = new ResourceSetImpl();
 

resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL,
Boolean.TRUE);
 
 EcoreUtil.resolveAll(resourceSet);
 
 Resource resource =
resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
 
 InputStream in = new
ByteArrayInputStream(expression.getBytes());
 
 try {
 
 resource.load(in, resourceSet.getLoadOptions());
 
 DSLModel model = (DSLModel)
resource.getContents().get(0);
 
 EcoreUtil.resolveAll(model);
 
 return model;
 
 } catch (IOException e) {
 
 // TODO Auto-generated catch block
 
 e.printStackTrace();
 
 }
 
 return null;
 
 
 }
 

 
 }
 
 
 
 
different code same behavior. It works fine when invoked from a
different java class but when invoked from Acceleo, though I see
it returns correct ClassImpl instances they are apparently not
properly turned into the equivalent ECORE entities.
 
</blockquote>
 
</body>
</html>

Re: Meshing ACCELEO and Xtext [message #902173 is a reply to message #902139]

Thu, 16 August 2012 04:43

Eclipse User

Ed I have added these lines to the Acceleo main module Java class:

 @Override
    public void initialize(EObject element, File folder, java.util.List<? extends Object> arguments) throws IOException {    preInitialize();
        super.initialize(element, folder, arguments);
    }
    @Override
    public void initialize(URI modelURI, File folder, java.util.List<?> arguments) throws IOException {
        preInitialize();
        super.initialize(modelURI, folder, arguments);
    }
    
    protected void preInitialize() {
       DSLStandaloneSetup.doSetup();
    }

and

@Override
    public void registerPackages(ResourceSet resourceSet) {
        super.registerPackages(resourceSet);
       if (!isInWorkspace(org.eclipse.uml2.uml.UMLPackage.class)) {
            resourceSet.getPackageRegistry().put(org.eclipse.uml2.uml.UMLPackage.eINSTANCE.getNsURI(), org.eclipse.uml2.uml.UMLPackage.eINSTANCE);
        }
        if (!isInWorkspace(mypackages.DSLPackage.class)) {
            resourceSet.getPackageRegistry().put(mypackages.DSLPackage.eINSTANCE.getNsURI(), mypackages.DSLPackage.eINSTANCE);
        }

but I still experience the same problem.

I have however noticed something new that I guess may help to understand the problem.
If I try this let:

 
[let dm:DSLModel = 'statement1;statement2;'.getDSLModel().oclAsType(DSLModel)]

I get this warning:

Undefined "Let" expression at line xx in Module ww for block let dm : DSLModel = getDSLModel('statement1;statement2').oclAsType(dsl::DSLModel). Last recorded value of self was org.eclipse.uml2.uml.internal.impl.ClassImpl@96f20a

Re: Meshing ACCELEO and Xtext [message #902176 is a reply to message #902173]

Thu, 16 August 2012 04:48

Eclipse User

Hi

The error means that

'statement1;statement2;'.getDSLModel().oclAsType(DSLModel)

evaluated to invalid so you can debug that with a breakpoint in
getDSLModel().

Regards

Ed Willink

On 16/08/2012 09:43, Andrea Sindico wrote:
> Ed I have added these lines to the Acceleo main module Java class:
>
>
> @Override
> public void initialize(EObject element, File folder,
> java.util.List<? extends Object> arguments) throws IOException {
> preInitialize();
> super.initialize(element, folder, arguments);
> }
> @Override
> public void initialize(URI modelURI, File folder, java.util.List<?>
> arguments) throws IOException {
> preInitialize();
> super.initialize(modelURI, folder, arguments);
> }
> protected void preInitialize() {
> DSLStandaloneSetup.doSetup();
> }
>
>
> and
>
>
> @Override
> public void registerPackages(ResourceSet resourceSet) {
> super.registerPackages(resourceSet);
> if (!isInWorkspace(org.eclipse.uml2.uml.UMLPackage.class)) {
> resourceSet.getPackageRegistry().put(org.eclipse.uml2.uml.UMLPackage.eINSTANCE.getNsURI(),
> org.eclipse.uml2.uml.UMLPackage.eINSTANCE);
> }
> if (!isInWorkspace(mypackages.DSLPackage.class)) {
> resourceSet.getPackageRegistry().put(mypackages.DSLPackage.eINSTANCE.getNsURI(),
> mypackages.DSLPackage.eINSTANCE);
> }
>
>
> but I still experience the same problem.
>
> I have however noticed something new that I guess may help to
> understand the problem. If I try this let:
>
>
> [let dm:DSLModel =
> 'statement1;statement2;'.getDSLModel().oclAsType(DSLModel)]
>
>
> I get this warning:
>
> Undefined "Let" expression at line xx in Module ww for block let dm :
> DSLModel =
> getDSLModel('statement1;statement2').oclAsType(dsl::DSLModel). Last
> recorded value of self was
> mailto:org.eclipse.uml2.uml.internal.impl.ClassImpl@96f20a
>
>
>

Re: Meshing ACCELEO and Xtext [message #902177 is a reply to message #902176]

Thu, 16 August 2012 04:56

Eclipse User

I did it and it seems there are no problems. Moreover if a run it,exactly the same class and not a copy, from an independent Java class it actually returns a valid AST of the input string.

Re: Meshing ACCELEO and Xtext [message #902178 is a reply to message #902177]

Thu, 16 August 2012 04:59

Eclipse User

Also if I run this

   [let dm:DSLModel = 'statement1;statement2;'.getDSLModel()]

the warning disappears (though it sill does not work)

[Updated on: Thu, 16 August 2012 05:00] by Moderator

Re: Meshing ACCELEO and Xtext [message #902179 is a reply to message #902177]

Thu, 16 August 2012 05:00

Eclipse User

Hi

Of course there is a problem. You have an error message.

An independent class is indeed independent. It has very different
initialization and that is ultimately what you need to debug.

Regards

Ed Willink

On 16/08/2012 09:56, Andrea Sindico wrote:
> I did it and it seems there are no problems. Moreover if a run
> it,exactly the same class and not a copy, from an independent Java
> class it actually returns a valid AST of the input string.

Re: Meshing ACCELEO and Xtext [message #902400 is a reply to message #901948]

Fri, 17 August 2012 09:16

Eclipse User

May the problem be I am actually using two different resource sets (one in the Acceleo module Java class and one in the XText Java service)? If so what is the right way to make the Java service retrieve the Acceleo resource set?

Re: Meshing ACCELEO and Xtext [message #902403 is a reply to message #902400]

Fri, 17 August 2012 09:41

Eclipse User

Hi

In my experience it's best to just ignore the Xtext ResourceSet; it
looks after injection and the Xtext bits nicely.

You are dealing with models and for that you use the Acceleo ResourceSet
; (also ignore the Acceleo meta-model ResourceSet).

What is 'the Java service'?

Regards

Ed Willink

On 17/08/2012 14:16, Andrea Sindico wrote:
> May the problem be I am actually using two different resource sets
> (one in the Acceleo module Java class and one in the XText Java
> service)? If so what is the right way to make the Java service
> retrieve the Acceleo resource set?

Re: Meshing ACCELEO and Xtext [message #902452 is a reply to message #902403]

Fri, 17 August 2012 12:13

Eclipse User

Hi Ed,
In the Acceleo terminlogy a service is a Java class implementing some "complex" operation wrapped by an acceleo module. In this case I meant the java class transforming a string with a DSL into an Ecore AST by means of XText.

To quickly if the problem was due to the resource set just to check I have added a static ReousceSet variable to the main acceleo module java class. I have therefore retrieved that from the XText java service and used that instead of instantiating a new one. Unfortunately it still behaves the same Acceleo does not seem to associate the implementation to the related ECORE.

while trying I have however noticed a weird thing I don't know if it could clarify or create more confusion. It happens that sometimes when I launch the Eclipse environment (but not every time I do that!) and run the acceleo transformation it properly manages the model elements retrieved from the Java XText service. It thus works. However as soon as I slightly change the code (i.e. add another tag) it stops working again.

Again thanks for your help

Regards

Re: Meshing ACCELEO and Xtext [message #902455 is a reply to message #902452]

Fri, 17 August 2012 12:37

Eclipse User

Hi

Do not abuse Xtext; in particular multiple initialization may corrupt
registries. The Xtext ResourceSet is for Xtext only.

Writing to global registries can also cause strange behaviours.

I don't understand this service business. I've looked at Acceleo
services a couple of times and always rejected them as not suitable for
my problem.

Regards

Ed Willink

On 17/08/2012 17:13, Andrea Sindico wrote:
>
> Hi Ed,
> In the Acceleo terminlogy a service is a Java class implementing some
> "complex" operation wrapped by an acceleo module. In this case I meant
> the java class transforming a string with a DSL into an Ecore AST by
> means of XText.
> To quickly if the problem was due to the resource set just to check I
> have added a static ReousceSet variable to the main acceleo module
> java class. I have therefore retrieved that from the XText java
> service and used that instead of instantiating a new one.
> Unfortunately it still behaves the same Acceleo does not seem to
> associate the implementation to the related ECORE.
> while trying I have however noticed a weird thing I don't know if it
> could clarify or create more confusion. It happens that sometimes when
> I launch the Eclipse environment (but not every time I do that!) and
> run the acceleo transformation it properly manages the model elements
> retrieved from the Java XText service. It thus works. However as soon
> as I slightly change the code (i.e. add another tag) it stops working
> again.
>
> Again thanks for your help
>
> Regards

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