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*'