diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/hooks/test/data-computed/schema.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/hooks/test/data-computed/schema.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,46 @@
+# copyright 2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of CubicWeb.
+#
+# CubicWeb is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+from yams.buildobjs import EntityType, String, Int, SubjectRelation, RelationDefinition
+
+THISYEAR = 2014
+
+class Person(EntityType):
+    name = String()
+    salaire = Int()
+    birth_year = Int(required=True)
+    travaille = SubjectRelation('Societe')
+    age = Int(formula='Any %d - D WHERE X birth_year D' % THISYEAR)
+
+class Societe(EntityType):
+    nom = String()
+    salaire_total = Int(formula='Any SUM(SA) GROUPBY X WHERE P travaille X, P salaire SA')
+
+
+class Agent(EntityType):
+    asalae_id = String(formula='Any E WHERE M mirror_of X, M extid E')
+
+class MirrorEntity(EntityType):
+    extid = String(required=True, unique=True,
+                   description=_('external identifier of the object'))
+
+
+class mirror_of(RelationDefinition):
+    subject  = 'MirrorEntity'
+    object = ('Agent', 'Societe')
+    cardinality = '?*'
+    inlined = True