465 class AttributeFacet(RelationFacet):

   465 class AttributeFacet(RelationFacet):

   466     # attribute type

   466     # attribute type

   467     attrtype = 'String'

   467     attrtype = 'String'

   468     # type of comparison: default is an exact match on the attribute value

   468     # type of comparison: default is an exact match on the attribute value

   469     comparator = '=' # could be '<', '<=', '>', '>='

   469     comparator = '=' # could be '<', '<=', '>', '>='

   470 

   471 

   471     def vocabulary(self):

   472     def vocabulary(self):

   472         """return vocabulary for this facet, eg a list of 2-uple (label, value)

   473         """return vocabulary for this facet, eg a list of 2-uple (label, value)

   473         """

   474         """

   474         rqlst = self.rqlst

   475         rqlst = self.rqlst

   489         # don't call rset_vocabulary on empty result set, it may be an empty

   490         # don't call rset_vocabulary on empty result set, it may be an empty

   490         # *list* (see rqlexec implementation)

   491         # *list* (see rqlexec implementation)

   491         return rset and self.rset_vocabulary(rset)

   492         return rset and self.rset_vocabulary(rset)

   492 

   493 

   493     def rset_vocabulary(self, rset):

   494     def rset_vocabulary(self, rset):

   495         return [(_(value), value) for value, in rset]

   499         return [(_(value), value) for value, in rset]

   496 

   500 

   497     def support_and(self):

   501     def support_and(self):

   498         return False

   502         return False

   499 

   503