model: introduce MConcern

[nit.git] / src / model / model_base.nit

diff --git a/src/model/model_base.nit b/src/model/model_base.nit
index a51ec29..666ce8e 100644 (file)
--- a/src/model/model_base.nit
+++ b/src/model/model_base.nit
@@ -29,6 +29,13 @@ abstract class MEntity
        fun name: String is abstract
 end
 
+# Something that represents a concern
+abstract class MConcern
+       super MEntity
+       # The concern that contains `self` or null if `self` is the root of the concern hierarchy
+       fun parent_concern: nullable MConcern is abstract
+end
+
 # A visibility (for modules, class and properties)
 # Valid visibility are:
 #