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

diff --git a/src/model/model_base.nit b/src/model/model_base.nit
index a97ede8..0a0d8b0 100644
--- a/src/model/model_base.nit
+++ b/src/model/model_base.nit
@@ -16,11 +16,19 @@
 
 # The abstract concept of model and related common things
 module model_base
+import location
 
 # The container class of a Nit object-oriented model.
 # A model knows modules, classes and properties and can retrieve them.
 class Model
 	super MEntity
+
+	redef fun model do return self
+
+	# Place-holder object that means no-location
+	#
+	# See `MEntity::location`
+	var no_location = new Location(null, 0, 0, 0, 0)
 end
 
 # A named and possibly documented entity in the model.
@@ -63,6 +71,16 @@ abstract class MEntity
 	# indirect use should be restricted (e.g. to name a web-page)
 	fun c_name: String is abstract
 
+	# The origin of the definition.
+	#
+	# Most model entities are defined in a specific place in the source base.
+	#
+	# Because most model entities have one,
+	# it is simpler for the client to have a non-nullable return value.
+	# For entities that lack a location, mock-up special locations are used instead.
+	# By default it is `model.no_location`.
+	fun location: Location do return model.no_location
+
 	# A Model Entity has a direct link to its model
 	fun model: Model is abstract
 
@@ -79,6 +97,17 @@ abstract class MEntity
 	# Note that the broken status is not propagated to enclosing and enclosed entities.
 	# e.g. a broken method does not make the whole module broken.
 	var is_broken = false is writable
+
+	# Is `self` created for internal purpose?
+	#
+	# Fictive entities are used internally but they should not be
+	# exposed to the final user.
+	var is_fictive: Bool = false is writable
+
+	# Is `self` created for unit testing purpose?
+	#
+	# See `nitunit`.
+	var is_test: Bool = false is writable
 end
 
 # Something that represents a concern