diff --git a/src/Moose-Core-Tests/MooseEntityTest.class.st b/src/Moose-Core-Tests/MooseEntityTest.class.st
index 0e1ca7aa..510dfe0a 100644
--- a/src/Moose-Core-Tests/MooseEntityTest.class.st
+++ b/src/Moose-Core-Tests/MooseEntityTest.class.st
@@ -30,17 +30,6 @@ MooseEntityTest >> testBookmark [
 	self assert: bookmark isBookmarked
 ]
 
-{ #category : #tests }
-MooseEntityTest >> testIsRoot [
-	| entity |
-	entity := self actualClass new.
-	entity stub parents willReturn: {  }.
-	self assert: entity isRoot.
-	
-	entity stub parents willReturn: { MooseEntity new }.
-	self deny: entity isRoot
-]
-
 { #category : #tests }
 MooseEntityTest >> testIsStub [
 	self deny: self actualClass new isStub.
diff --git a/src/Moose-Core/MooseEntity.class.st b/src/Moose-Core/MooseEntity.class.st
index daba30eb..020a71c7 100644
--- a/src/Moose-Core/MooseEntity.class.st
+++ b/src/Moose-Core/MooseEntity.class.st
@@ -184,13 +184,6 @@ MooseEntity >> isMooseEntity [
 	^ true
 ]
 
-{ #category : #testing }
-MooseEntity >> isRoot [
-	"Return true if the entity is not contained in any other entity."
-
-	^ self parents isEmpty
-]
-
 { #category : #testing }
 MooseEntity >> isStub [
 	^ self attributeAt: #privateIsStub ifAbsent: [ false ]
diff --git a/src/Moose-Query/TEntityMetaLevelDependency.trait.st b/src/Moose-Query/TEntityMetaLevelDependency.trait.st
index 00fe3cd6..7a190c41 100644
--- a/src/Moose-Query/TEntityMetaLevelDependency.trait.st
+++ b/src/Moose-Query/TEntityMetaLevelDependency.trait.st
@@ -699,6 +699,16 @@ TEntityMetaLevelDependency >> isIncludedIn: anEntity parentSelectorsCache: paren
 	^ false
 ]
 
+{ #category : #testing }
+TEntityMetaLevelDependency >> isRoot [
+
+	<FMProperty: #isRoot type: #Boolean>
+	<derived>
+	<FMComment:
+	'An entity is root if it has no parent in the model. This is useful for example to be able to build visualization where the displayed elements are the roots of the model and to let those elements be expanded to display their children.'>
+	^ self parents isEmpty
+]
+
 { #category : #accessing }
 TEntityMetaLevelDependency >> numberOfChildren [
 	<FMProperty: #numberOfChildren type: #Number>