[1301] Add support to serialize referenced object concrete type in JSON

resource

Bug: #1301
Signed-off-by: Laurent Fasani <laurent.fasani@obeo.fr>

CHANGELOG.adoc

@@ -55,6 +55,7 @@ https://github.com/eclipse-sirius/sirius-components/issues/1231[#1231] [diagram]
 - [ADR-64] Add support for a ToggableAreaContainer in forms
 - [ADR-65] Add support for a tree widget in forms
 - [ADR-66] Add a new "Related Elements" view
+- [ADR-67] Add support for having inter model references
 
 === Breaking changes
 
@@ -87,6 +88,7 @@ The actual definition of the application (e.g. Sirius Web), which must provide a
 - https://github.com/eclipse-sirius/sirius-components/issues/1300[#1300] [core] Rename SiriusWebJSONResourceFactoryImpl to
 JSONResourceFactoryImpl.
 - https://github.com/eclipse-sirius/sirius-emf-json/issues/9[#9] [releng] Update emfjson dependency.
+- https://github.com/eclipse-sirius/sirius-components/issues/1301[#1301] [core] Add support for having inter model references.
 
 === New features
 

doc/adrs/067_add_support_for_intermodel_reference.adoc

@@ -0,0 +1,26 @@
+= ADR-067 - Add suport for intermodel references
+
+== Context
+
+The context is an EMF editing context with a ResourceSet containing at least two models and references between the models.
+We should be have to load and save properly those models.
+
+Currently, the URI used to add resources in the ResourceSet is the id of the document.
+That is an issue because IllegalArgumentException are raised from some EMF code part (such as URI.resolve(URI)).
+A valid URI must contain a scheme.
+So the URI of the resources added to the resourceSet should be on the form:
+`<scheme>:///<id de la resource>`
+
+For the URI, corresponding to document added in the project, loaded as JSONResource, the URI scheme is arbitrary : 
+``sirius``
+Example: `sirius:///a264d307-97d9-451d-90f5-46d38668b69c`
+
+== Decision
+
+For the URI, corresponding to document added in the project, loaded as JSONResource, the URI scheme is arbitrary : 
+``sirius``
+Example: `sirius:///a264d307-97d9-451d-90f5-46d38668b69c`
+
+== Status
+
+Accepted.

packages/emf/backend/sirius-components-emf/src/main/java/org/eclipse/sirius/components/emf/services/JSONResourceFactoryImpl.java

@@ -33,6 +33,8 @@ public JsonResource createResource(URI uri) {
         Map<String, Object> options = new HashMap<>();
 
         options.put(JsonResource.OPTION_ID_MANAGER, new EObjectIDManager());
+        options.put(JsonResource.OPTION_DISPLAY_DYNAMIC_INSTANCES, true);
+
         return new JsonResourceImpl(uri, options);
     }
 }