code: @Override
      public List<org.fcrepo.server.types.gen.Datastream> getDatastreamHistory(String pid,
                                                                               String dsID) {
          assertInitialized();
          try {
              MessageContext ctx = context.getMessageContext();
              org.fcrepo.server.storage.types.Datastream[] intDatastreams =
                      m_management.getDatastreamHistory(ReadOnlyContext
                              .getSoapContext(ctx), pid, dsID);
              return getGenDatastreams(intDatastreams);
          } catch (Throwable th) {
              LOG.error("Error getting datastream history", th);
              throw CXFUtility.getFault(th);
          }
      }
docs: /*
  (non-Javadoc)
  @see
  org.fcrepo.server.management.FedoraAPIMMTOM#getDatastreamHistory(java
  .lang.String pid ,)String dsID )*