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−# copyright 2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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−# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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−#
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−# This file is part of CubicWeb.
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−#
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−# CubicWeb is free software: you can redistribute it and/or modify it under the
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−# terms of the GNU Lesser General Public License as published by the Free
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−# Software Foundation, either version 2.1 of the License, or (at your option)
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−# any later version.
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−#
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−# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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−# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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−# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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−# details.
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−#
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−# You should have received a copy of the GNU Lesser General Public License along
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−# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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−from yams.buildobjs import EntityType, String, Int, SubjectRelation
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−
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−THISYEAR = 2014
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−
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−class Person(EntityType):
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−    name = String()
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−    salaire = Int()
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−    birth_year = Int(required=True)
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−    travaille = SubjectRelation('Societe')
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−    age = Int(formula='Any %d - D WHERE X birth_year D' % THISYEAR)
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−
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−class Societe(EntityType):
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−    nom = String()
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−    salaire_total = Int(formula='Any SUM(SA) GROUPBY X WHERE P travaille X, P salaire SA')