Format

SEM_APIS.CONVERT_TO_WKT_LITERAL(
     geom         IN SDO_GEOMETRY, 
     srid_prefix  IN VARCHAR2 default NULL, 
     options      IN VARCHAR2 default NULL,
     network_owner    IN VARCHAR2 DEFAULT NULL,
     network_name     IN VARCHAR2 default NULL
     )RETURN CLOB;

Description

Serializes an SDO_GEOMETRY object into an ogc:wktLiteral value.

Parameters

geom

SDO_GEOMETRY object to be serialized.

srid_prefix

Spatial reference system URI prefix that should be used in the ogc:wktLiteral instead of the default. The resulting SRID URI will be of the form <srid_prefix/{srid}>.

options

String specifying options for transformation. Available options are:

• ORACLE_PREFIX=T. Generate SRID URIs of the form <http://xmlns.oracle.com/rdf/geo/srid/{srid}>.

network_owner

Owner of the RDF network. (See Table 1-2.)

network_name

Name of the RDF network. (See Table 1-2.)

Usage Notes

The procedure SDO_UTIL.TO_WKTGEOMETRY is used internally to create the geometry literal with a certain spatial reference system URI.

Standard SRID URIs are used by default (<http://www.opengis.net/def/crs/EPSG/0/{srid}> or (<http://www.opengis.net/def/crs/OGC/1.3/CRS84>>).

For more information about geometry serialization, see SDO_UTIL.TO_WKTGEOMETRY.

For information about RDF network types and options, see RDF Networks.

Examples

The following example shows three different uses of this function for a geometry with SRID 8307. The COLA_MARKETS table is the one from the simple example in Oracle Spatial Developer's Guide.

INSERT INTO cola_markets VALUES(
  10,
  'cola_x',
  SDO_GEOMETRY(
    2003,
    8307, -- SRID
    NULL,
    SDO_ELEM_INFO_ARRAY(1,1003,3),
    SDO_ORDINATE_ARRAY(1,1, 6,13)
  )
);
commit;

SELECT
sem_apis.convert_to_wkt_literal(shape) as wkt1,
sem_apis.convert_to_wkt_literal(shape,'http://my.org/') as wkt2,
sem_apis.convert_to_wkt_literal(shape,null,' ORACLE_PREFIX=T ') as wkt3
FROM cola_markets;

"<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON ((1.0 1.0, 6.0 1.0, 6.0 13.0, 1.0 13.0, 1.0 1.0))"^^<http://www.opengis.net/ont/geosparql#wktLiteral>
"<http://my.org/8307> POLYGON ((1.0 1.0, 6.0 1.0, 6.0 13.0, 1.0 13.0, 1.0 1.0))"^^<http://www.opengis.net/ont/geosparql#wktLiteral>
"<http://xmlns.oracle.com/rdf/geo/srid/8307> POLYGON ((1.0 1.0, 6.0 1.0, 6.0 13.0, 1.0 13.0, 1.0 1.0))"^^<http://www.opengis.net/ont/geosparql#wktLiteral>