@abc.abstractmethod<EOL><INDENT>def get_proficiency_form_for_update(self, proficiency_id):<DEDENT>
return<EOL>
Gets the proficiency form for updating an existing proficiency.

        :param proficiency_id: the ``Id`` of the ``Proficiency``
        :type proficiency_id: ``osid.id.Id``
        :return: the proficiency form
        :rtype: ``osid.learning.ProficiencyForm``
        :raise: ``NotFound`` -- ``proficiency_id`` is not found
        :raise: ``NullArgument`` -- ``proficiency_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*