@abc.abstractmethod<EOL><INDENT>def get_proficiencies_by_query(self, proficiency_query):<DEDENT>
return<EOL>
Gets a list of ``Proficiencies`` matching the given proficiency query.

        :param proficiency_query: the proficiency query
        :type proficiency_query: ``osid.learning.ProficiencyQuery``
        :return: the returned ``ProficiencyList``
        :rtype: ``osid.learning.ProficiencyList``
        :raise: ``NullArgument`` -- ``proficiency_query`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``proficiency_query`` is not of this service

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