def supports_trust_type(self, trust_type=None):
if trust_type is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>return False<EOL>
Tests if the given trust type is supported.

        arg:    trust_type (osid.type.Type): a ``Type`` indicating a
                trust type
        return: (boolean) - ``true`` if the given Type is supported,
                ``false`` otherwise
        raise:  NullArgument - ``trust_type`` is ``null``
        *compliance: mandatory -- This method must be implemented.*