docs: def get_repositories_by_ids(self, repository_ids=None):
          """Gets a ``RepositoryList`` corresponding to the given ``IdList``.
  
          In plenary mode, the returned list contains all of the
          repositories specified in the ``Id`` list, in the order of the
          list, including duplicates, or an error results if an ``Id`` in
          the supplied list is not found or inaccessible. Otherwise,
          inaccessible ``Repositories`` may be omitted from the list and
          may present the elements in any order including returning a
          unique set.
  
          arg:    repository_ids (osid.id.IdList): the list of ``Ids`` to
                  retrieve
          return: (osid.repository.RepositoryList) - the returned
                  ``Repository list``
          raise:  NotFound - an ``Id`` was not found
          raise:  NullArgument - ``repository_ids`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from awsosid template for -
          # osid.resource.BinLookupSession.get_bins_by_ids_template
          if not self._can('lookup'):
              raise PermissionDenied()
          else:
              return self._provider_session.get_repositories_by_ids(repository_ids)