code: public static StreamBootstrapper getInstance(String pubId, SystemId sysId, byte[] data, int start, int end)
      {
          return new StreamBootstrapper(pubId, sysId, data, start, end);
      }
docs: Factory method used when the underlying data provider is a pre-allocated
  block source, and no stream is used.
  Additionally the buffer passed is not owned by the bootstrapper
  or Reader that is created, so it is not to be recycled.