code: public void createPackageContents()
    {
      if (isCreated) return;
      isCreated = true;
  
      // Create classes and their features
      modelEClass = createEClass(MODEL);
      createEReference(modelEClass, MODEL__IMPORT_SECTION);
      createEReference(modelEClass, MODEL__BLOCK);
    }
docs: Creates the meta-model objects for the package.  This method is
  guarded to have no affect on any invocation but its first.
  <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated