SDO_UTIL.TO_WKTGEOMETRY crashes when processing collection

Question

Hi folks,
Another weird WKT thing. I have what I think is a very reasonable collection comprising one polygon with a bunch of holes and one linestring. SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT says the geometry is valid. However when I attempt to convert the geometry to WKT, I get a generic java runtime error on 11.1.0.6 and a specific error on 10.2.0.4 of
ORA-29532: Java call terminated by uncaught Java exception: java.lang.RuntimeException: oracle.spatial.util.GeometryExceptionWithContext: Unsupported collection element: elemInfo type 2003
ORA-06512: at "MDSYS.SDO_UTIL", line 2495
ORA-06512: at "MDSYS.SDO_UTIL", line 2517
ORA-06512: at line 561
Why would a 2003 polygon not be supported in a collection?
Thanks!
Paul
Here is the procedure with the troublesome geometry:
DECLARE
sdo_example SDO_GEOMETRY;
str_validate VARCHAR2(16);
clb_wkt CLOB;
BEGIN
sdo_example := SDO_GEOMETRY
2004,
8265,
NULL,
SDO_ELEM_INFO_ARRAY
1,
1003,
1,
415,
2003,
1,
433,
2003,
1,
451,
2003,
1,
471,
2003,
1,
485,
2003,
1,
499,
2,
1
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str_validate := SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(sdo_example,0.5);
dbms_output.put_line(str_validate);
clb_wkt := SDO_UTIL.TO_WKTGEOMETRY(sdo_example);
END;

Answer 1

Hi Siva,
That makes sense that Oracle is using an older version of the WKT specification. But when I look at the documentation on these WKT functions, there is no mention of the specification used. For example, the GML converter specifies GML 2.0 right in the documentation. Do you know the version of WKT is currently supported by Oracle? Where is this documented? I should also note that it doesn't seem to mention anywhere that Oracle WKT functions are restricted to two-dimensional geometries only. Is this mainly a case of really poor documentation?
Anyhow, on page 21 of the current WKT specification 1.2, it states that GEOMETRYCOLLECTIONs:
A GeometryCollection is a geometric object that is a collection of some number of geometric objects.
All the elements in a GeometryCollection shall be in the same Spatial Reference System. This is also the Spatial
Reference System for the GeometryCollection.
GeometryCollection places no other constraints on its elements. Subclasses of GeometryCollection may restrict
membership based on dimension and may also place other constraints on the degree of spatial overlap between
elements.
Cheers and thanks for your help!
Paul