MyModel
|-SomethingWithGenericInput
| |-parameter: Sample
|
|-Sample<T>
| |-(generic) T
| |-value: T
| |-probability: EDouble
|
|-IntSample -> Sample<EIntegerObject>

numeric_int_sample returns IntSample: 
	LPAREN value=SIGNED_INT //INT
	SEMI probability=DOUBLE  //DOUBLE
	RPAREN
;

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="dully" nsURI="http://www.example.com/dully" nsPrefix="dully">
  <eClassifiers xsi:type="ecore:EClass" name="Model">
    <eStructuralFeatures xsi:type="ecore:EReference" name="samples" upperBound="-1"
        eType="#//IntSample" containment="true"/>
  </eClassifiers>
  <eClassifiers xsi:type="ecore:EClass" name="Sample">
    <eTypeParameters name="T"/>
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value">
      <eGenericType eTypeParameter="#//Sample/T"/>
    </eStructuralFeatures>
  </eClassifiers>
  <eClassifiers xsi:type="ecore:EClass" name="IntSample">
    <eGenericSuperTypes eClassifier="#//Sample">
      <eTypeArguments eClassifier="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EIntegerObject"/>
    </eGenericSuperTypes>
  </eClassifiers>
</ecore:EPackage>

// automatically generated by Xtext
grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

import "http://www.example.com/dully" 
import "http://www.eclipse.org/emf/2002/Ecore" as ecore

Model returns Model:
	{Model}
	'Model'
	'{'
		('samples' '{' samples+=IntSample ( "," samples+=IntSample)* '}' )?
	'}';


IntSample returns IntSample:
	{IntSample}
	'IntSample'
	'{'
		('value' value=EJavaObject)?
	'}';

EJavaObject returns ecore::EIntegerObject:
	'EJavaObject' /* TODO: implement this rule and an appropriate IValueConverter */;