{
    if (length == -1)
    {
      EAnnotation eAnnotation = getAnnotation(eDataType, false);
      if (eAnnotation != null)
      {
        eAnnotation.getDetails().remove("length");
      }
    }
    else
    {
      EAnnotation eAnnotation = getAnnotation(eDataType, true);
      eAnnotation.getDetails().put("length", Integer.toString(length));
    } 
    getExtendedMetaData(eDataType).setLengthFacet(length);
  }