diff --git a/repository/OpenPonk-Core/OPDiagramSerializer.class.st b/repository/OpenPonk-Core/OPDiagramSerializer.class.st
index d5c0bda4..ccc2b22c 100644
--- a/repository/OpenPonk-Core/OPDiagramSerializer.class.st
+++ b/repository/OpenPonk-Core/OPDiagramSerializer.class.st
@@ -12,11 +12,6 @@ OPDiagramSerializer class >> exportSubject [
 	^ #diagram
 ]
 
-{ #category : 'accessing' }
-OPDiagramSerializer >> formatName [
-	^ self subclassResponsibility
-]
-
 { #category : 'serialize/materialize' }
 OPDiagramSerializer >> materializeDiagramOf: aModel from: aStream [
 	"materialize aStream into a diagram that will be consumed by your controller"
diff --git a/repository/OpenPonk-Core/OPJsonDiagramSerializer.class.st b/repository/OpenPonk-Core/OPJsonDiagramSerializer.class.st
index 41bd92a8..a883793f 100644
--- a/repository/OpenPonk-Core/OPJsonDiagramSerializer.class.st
+++ b/repository/OpenPonk-Core/OPJsonDiagramSerializer.class.st
@@ -24,11 +24,6 @@ OPJsonDiagramSerializer class >> minImportVersion [
 	^ 1
 ]
 
-{ #category : 'accessing' }
-OPJsonDiagramSerializer >> formatName [
-	^ 'json'
-]
-
 { #category : 'serialize/materialize' }
 OPJsonDiagramSerializer >> materializeDiagramOf: aModel from: aStream [
 
diff --git a/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st b/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
index 3a171322..9f6c0f73 100644
--- a/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
+++ b/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
@@ -40,14 +40,15 @@ OPMementoDirectorySerializer >> loadDiagramsOf: aModel from: aFolder [
 	| materializer |
 	aFolder exists ifFalse: [ ^ #(  ) ].
 	materializer := aFolder files
-		                detect: [ :any | any basename = OPExportInfo fileName ]
-		                ifFound: [ :exportInfoFile | 
+		                detect: [ :any |
+		                any basename = OPExportInfo fileName ]
+		                ifFound: [ :exportInfoFile |
 		                OPSerializer forExportInfoFile: exportInfoFile ]
 		                ifNone: [ OPJsonDiagramSerializer new ].
-	^ ((aFolder filesMatching: '*.' , materializer formatName) reject: [ 
-		   :any | any basename = OPExportInfo fileName ]) collect: [ 
-		  :eachFile | 
-		  self loadDiagramOf: aModel from: eachFile by: materializer ]
+	^ ((aFolder filesMatching: '*.' , materializer fileExtension)
+		   reject: [ :any | any basename = OPExportInfo fileName ])
+		  collect: [ :eachFile |
+			  self loadDiagramOf: aModel from: eachFile by: materializer ]
 ]
 
 { #category : 'loading' }
@@ -75,13 +76,15 @@ OPMementoDirectorySerializer >> loadModelFrom: aFolder [
 
 	| modelFile materializer |
 	materializer := aFolder files
-		                detect: [ :any | any basename = OPExportInfo fileName ]
-		                ifFound: [ :exportInfoFile | 
-		                plugin modelSerializerClass forExportInfoFile: exportInfoFile ]
+		                detect: [ :any |
+		                any basename = OPExportInfo fileName ]
+		                ifFound: [ :exportInfoFile |
+			                plugin modelSerializerClass forExportInfoFile:
+				                exportInfoFile ]
 		                ifNone: [ plugin modelSerializerClass new ].
-	modelFile := aFolder / 'model' , materializer formatName.
+	modelFile := aFolder / 'model' , materializer fileExtension.
 	modelFile exists ifFalse: [ ^ nil ].
-	^ modelFile readStreamDo: [ :stream | 
+	^ modelFile readStreamDo: [ :stream |
 		  materializer materializeModelFrom: stream ]
 ]
 
@@ -92,9 +95,9 @@ OPMementoDirectorySerializer >> saveDiagram: aDiagram to: aFolder index: aNumber
 	diagramSerializer := OPStonDiagramSerializer new.
 	(aFolder
 	 / (aNumber asString , '-' , (aDiagram name ifEmpty: [ 'diagram' ]))
-	 , diagramSerializer formatName)
+	 , diagramSerializer fileExtension)
 		ensureDelete;
-		writeStreamDo: [ :stream | 
+		writeStreamDo: [ :stream |
 			stream nextPutAll: (diagramSerializer serializeDiagram: aDiagram) ]
 ]
 
@@ -133,7 +136,7 @@ OPMementoDirectorySerializer >> saveModelOf: aMemento to: aFolder [
 			'Saving UUID from method: ' , each uuid asString ].
 	modelSerializer := plugin modelSerializerClass new.
 	modelSerializer class saveExportInfoTo: aFolder.
-	(aFolder / 'model' , modelSerializer formatName)
+	(aFolder / 'model' , modelSerializer fileExtension)
 		ensureDelete;
 		writeStreamDo: [ :stream |
 			stream nextPutAll: (modelSerializer serializeModel: aMemento model) ]
diff --git a/repository/OpenPonk-Core/OPModelSerializer.class.st b/repository/OpenPonk-Core/OPModelSerializer.class.st
index 79e34d1e..5ef3a24b 100644
--- a/repository/OpenPonk-Core/OPModelSerializer.class.st
+++ b/repository/OpenPonk-Core/OPModelSerializer.class.st
@@ -15,11 +15,6 @@ OPModelSerializer class >> exportSubject [
 	^ #model
 ]
 
-{ #category : 'formatting' }
-OPModelSerializer >> formatName [
-	^ 'model'
-]
-
 { #category : 'serialize/materialize' }
 OPModelSerializer >> materializeModelFrom: aStream [
 	"materialize aStream into a model instance"
diff --git a/repository/OpenPonk-Core/OPSerializer.class.st b/repository/OpenPonk-Core/OPSerializer.class.st
index e17d43fc..908a751b 100644
--- a/repository/OpenPonk-Core/OPSerializer.class.st
+++ b/repository/OpenPonk-Core/OPSerializer.class.st
@@ -27,6 +27,12 @@ OPSerializer class >> exportVersion [
 	^ self subclassResponsibility
 ]
 
+{ #category : 'accessing' }
+OPSerializer class >> fileExtension [
+
+	^ self formatName
+]
+
 { #category : 'as yet unclassified' }
 OPSerializer class >> forExportInfo: anExportInfo [
 
@@ -90,3 +96,13 @@ OPSerializer class >> supportsExportInfo: anExportInfo [
 		  on: SubclassResponsibility
 		  do: [ false ]
 ]
+
+{ #category : 'accessing' }
+OPSerializer >> fileExtension [
+	^ self class fileExtension
+]
+
+{ #category : 'formatting' }
+OPSerializer >> formatName [
+	^ self class formatName
+]
diff --git a/repository/OpenPonk-Core/OPStonDiagramSerializer.class.st b/repository/OpenPonk-Core/OPStonDiagramSerializer.class.st
index 9128e152..34f418ca 100644
--- a/repository/OpenPonk-Core/OPStonDiagramSerializer.class.st
+++ b/repository/OpenPonk-Core/OPStonDiagramSerializer.class.st
@@ -24,11 +24,6 @@ OPStonDiagramSerializer class >> minImportVersion [
 	^ 1
 ]
 
-{ #category : 'accessing' }
-OPStonDiagramSerializer >> formatName [
-	^ 'ston'
-]
-
 { #category : 'serialize/materialize' }
 OPStonDiagramSerializer >> materializeDiagramOf: aModel from: aStream [
 
diff --git a/repository/OpenPonk-Core/OPStonModelSerializer.class.st b/repository/OpenPonk-Core/OPStonModelSerializer.class.st
index bd280886..1530949e 100644
--- a/repository/OpenPonk-Core/OPStonModelSerializer.class.st
+++ b/repository/OpenPonk-Core/OPStonModelSerializer.class.st
@@ -31,11 +31,6 @@ OPStonModelSerializer class >> minImportVersion [
 	^ 1
 ]
 
-{ #category : 'accessing' }
-OPStonModelSerializer >> formatName [
-	^ 'ston'
-]
-
 { #category : 'serialize/materialize' }
 OPStonModelSerializer >> materializeModelFrom: aStream [
 	^ self stonMaterialize: aStream