X-Git-Url: http://nitlanguage.org

diff --git a/src/model/mproject.nit b/src/model/mproject.nit
index 4208008..7bd502e 100644
--- a/src/model/mproject.nit
+++ b/src/model/mproject.nit
@@ -21,7 +21,7 @@ import poset
 
 # A Nit project, thas encompass a product
 class MProject
-	super MEntity
+	super MConcern
 
 	# The name of the project
 	redef var name: String
@@ -44,11 +44,14 @@ class MProject
 		model.mprojects.add(self)
 		model.mproject_by_name.add_one(name, self)
 	end
+
+	# MProject are always roots of the concerns hierarchy
+	redef fun parent_concern do return null
 end
 
 # A group of modules in a project
 class MGroup
-	super MEntity
+	super MConcern
 
 	# The name of the group
 	# empty name for a default group in a single-module project
@@ -74,6 +77,9 @@ class MGroup
 	# nesting group (see `parent`) is bigger
 	var in_nesting: POSetElement[MGroup]
 
+	# Is `self` the root of its project?
+	fun is_root: Bool do return mproject.root == self
+
 	# The filepath (usualy a directory) of the group, if any
 	var filepath: nullable String writable
 
@@ -89,6 +95,11 @@ class MGroup
 		end
 	end
 
+	redef fun parent_concern do
+		if not is_root then return parent
+		return mproject
+	end
+
 	redef fun to_s do return name
 end