@utilities.arguments_not_none<EOL><INDENT>def search_among_proficiencies(self, proficiency_ids):<DEDENT>
self._id_list = proficiency_ids<EOL>
Execute this search among the given list of proficiencies.

        arg:    proficiency_ids (osid.id.IdList): list of proficiencies
        raise:  NullArgument - ``proficiency_ids`` is ``null``
        *compliance: mandatory -- This method must be implemented.*