@utilities.arguments_not_none<EOL><INDENT>def get_activity_record(self, activity_record_type):<DEDENT>
return self._get_record(activity_record_type)<EOL>
Gets the activity record corresponding to the given ``Activity`` record ``Type``.

        This method is used to retrieve an object implementing the
        requested record. The ``activity_record_type`` may be the
        ``Type`` returned in ``get_record_types()`` or any of its
        parents in a ``Type`` hierarchy where
        ``has_record_type(activity_record_type)`` is ``true`` .

        arg:    activity_record_type (osid.type.Type): the type of the
                record to retrieve
        return: (osid.learning.records.ActivityRecord) - the activity
                record
        raise:  NullArgument - ``activity_record_type`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unsupported - ``has_record_type(activity_record_type)``
                is ``false``
        *compliance: mandatory -- This method must be implemented.*