Database Software

Why is the 2D compound line string valid, but the 3D one is not (ORA 11.2.0.3)?

--validates TRUE

SELECT sdo_geom.validate_geometry_with_context(
  SDO_GEOMETRY(2002,NULL,NULL,
    SDO_ELEM_INFO_ARRAY(1,4,2, 1,2,1, 3,2,2), 
    SDO_ORDINATE_ARRAY(
      10,10, 
      10,14, 
       6,10, 
      14,10)),0.001)
  FROM dual;

--validates 54530 Point:0,Edge:1,

SELECT sdo_geom.validate_geometry_with_context(
  SDO_GEOMETRY(3002,NULL,NULL,
    SDO_ELEM_INFO_ARRAY(1,4,2, 1,2,1, 4,2,2), 
    SDO_ORDINATE_ARRAY(
      10,10,0, 
      10,14,0, 
       6,10,0, 
      14,10,0)),0.001)
  FROM dual;