def get_objective_id(self):
<EOL>if not bool(self._my_map['<STR_LIT>']):<EOL><INDENT>raise errors.IllegalState('<STR_LIT>')<EOL><DEDENT>return Id(self._my_map['<STR_LIT>'])<EOL>
Gets the ``Id`` of the related objective.

        return: (osid.id.Id) - the objective ``Id``
        *compliance: mandatory -- This method must be implemented.*