def __call__(self, context):
     return SimpleVocabulary(
         [
             SimpleTerm(u"object", u"object", _(u"From rule's container")),
             SimpleTerm(u"target", u"target", _(u"From content that triggered the event")),
             SimpleTerm(u"parent", u"parent", _(u"From content's parent")),
         ]
     )
 def summary(self):
     return _('action_summary',
              default=u'Email to users defined in the "${fieldName}" data',
              mapping=dict(fieldName=self.fieldName))