Search for all subjects related to the specified subject and predicate.

        :param subject:
        :param object:
        :rtype: generator of RDF statements

def get_objects(self, subject, predicate):
        """
        Search for all subjects related to the specified subject and predicate.

        :param subject:
        :param object:
        :rtype: generator of RDF statements
        """
        for statement in self.spo_search(subject=subject, predicate=predicate):
            yield str(statement[2])