class Personne(EntityType):

    nom = String(required=True)

    prenom = String()

    type = String()

    travaille = SubjectRelation('Societe')

    evaluee = SubjectRelation(('Note', 'Personne'))

    connait = SubjectRelation('Personne', symetric=True)

class Societe(EntityType):

    nom = String()

    evaluee = SubjectRelation('Note')

class Note(EntityType):

    type = String()

    ecrit_par = SubjectRelation('Personne')

class SubNote(Note):

    __specializes_schema__ = True

    description = String()

class tags(RelationDefinition):

    subject = 'Tag'

    object = ('Personne', 'Note')

class evaluee(RelationDefinition):

    subject = 'EUser'

    object = 'Note'