186 

   186 

   187 import logging

   187 import logging

   188 from warnings import warn

   188 from warnings import warn

   189 from operator import eq

   189 from operator import eq

   190 

   190 

   192 from logilab.common.interface import implements as implements_iface

   191 from logilab.common.interface import implements as implements_iface

   193 from logilab.common.registry import Predicate, objectify_predicate, yes

   192 from logilab.common.registry import Predicate, objectify_predicate, yes

   194 

   193 

   195 from yams.schema import BASE_TYPES, role_name

   194 from yams.schema import BASE_TYPES, role_name

   196 from rql.nodes import Function

   195 from rql.nodes import Function