class para(AttributeRelationType):
    permissions = {
        'read':   ('managers', 'users', 'guests'),
        'add':    ('managers', ERQLExpression('X in_state S, S name "todo"')),
        'delete': ('managers', ERQLExpression('X in_state S, S name "todo"')),
        }

class in_state(RelationDefinition):
    subject = 'Note'
    object = 'State'
    cardinality = '1*'
    constraints=[RQLConstraint('S is ET, O state_of ET')]
    
class wf_info_for(RelationDefinition):
    subject = 'TrInfo'
    object = 'Note'
    cardinality = '1*'