1 from yams.buildobjs import ComputedRelation, EntityType, RelationDefinition

     2 from cubicweb.schema import RRQLExpression

     3 

     4 class Subject(EntityType):

     5     pass

     6 

     7 class Object(EntityType):

     8     pass

     9 

    10 class relation(RelationDefinition):

    11     subject = 'Subject'

    12     object = 'Object'

    13 

    14 class computed(ComputedRelation):

    15     rule = 'S relation O'

    16     __permissions__ = {'read': (RRQLExpression('S is ET'),)}