def is_permitted(self, identifiers, permission_s):
return self.authorizer.is_permitted(identifiers, permission_s)<EOL>
:type identifiers: SimpleIdentifierCollection

:param permission_s: a collection of 1..N permissions
:type permission_s: List of Permission object(s) or String(s)

:returns: a List of tuple(s), containing the Permission and a Boolean
          indicating whether the permission is granted