SDO_UTIL.FROM_WKTGEOMETRY seems ignorant of ring rotation

Question

Hello,
Back with more WKT issues. The OGC WKT spec does not enforce any kind of ring rotation on its polygons. However Oracle SDO_GEOMETRY does. When SDO_UTIL.FROM_WKTGEOMETRY converts a WKT polygon it doesn't seem to correct the ring rotation - it just leaves the rings rotated exactly as in the WKT resulting in invalid SDO_GEOMETRY polygons. Wouldn't this be a bug? I can't find anywhere in the SDO_UTIL documentation where we are told to always runs RECTIFY_GEOMETRY after the conversion.
Simple Example:
{color:#008000}SELECT SDO_UTIL.VALIDATE_WKTGEOMETRY('
POLYGON((
-76.57418668270113 38.91891450597657,
-76.57484114170074 38.91758725401061,
-76.57661139965057 38.91881851059802,
-76.57418668270113 38.91891450597657
))') FROM dual
{color}
returns TRUE though ring is clockwise - okay for WKT.
But when we convert it to SDO_GEOMETRY, the ring is still clockwise and throws an error
{color:#008000}SELECT SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(
SDO_GEOMETRY('
POLYGON((
-76.57418668270113 38.91891450597657,
-76.57484114170074 38.91758725401061,
-76.57661139965057 38.91881851059802,
-76.57418668270113 38.91891450597657
))',8265),0.0001) FROM dual
{color}
returns {color:#ff0000}13367 [Element <1>] [Ring <1>]
{color}{color:#000000}
So is this a bug or a feature? Does all WKT polygons coming into Oracle need to have their rings prerotated and if so, why would VALIDATE_WKTGEOMETRY not warn us of the problem.
Cheers,
Paul
{color}

Answer 1

Paul,
In case you are not aware:
SELECT SDO_MIGRATE.TO_CURRENT(
MDSYS.SDO_GEOMETRY('POLYGON((-76.57418668270113 38.91891450597657,-76.57484114170074 38.91758725401061,-76.57661139965057 38.91881851059802,-76.57418668270113 38.91891450597657))',8265)
,SDO_DIM_ARRAY(SDO_DIM_ELEMENT('X', -99999.00000, 99999.00000, 0.0001),SDO_DIM_ELEMENT('Y', -99999.00000, 99999.00000, 0.0001)))
FROM dual
---produces:
MDSYS.SDO_GEOMETRY(2003, 8265, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), MDSYS.SDO_ORDINATE_ARRAY(-76.5741866827011,38.9189145059766,-76.5766113996506,38.918818510598,-76.5748411417007,38.9175872540106,-76.5741866827011,38.9189145059766))
---thus:
SELECT SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(
MDSYS.SDO_GEOMETRY(2003, 8265, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), MDSYS.SDO_ORDINATE_ARRAY(-76.5741866827011,38.9189145059766,-76.5766113996506,38.918818510598,-76.5748411417007,38.9175872540106,-76.5741866827011,38.9189145059766))
,0.0001) FROM dual
---produces: TRUE
r,
dennis