To Create a Sub-Feature

Create the table with one geometry column, one ID, one angle field, and one foreign key.
CREATE TABLE DEVICE

(Id NUMBER PRIMARY KEY,

LinkedID NUMBER,

NAME VARCHAR2(50),

GEOMETRY MDSYS.SDO_GEOMETRY);
Insert the table metadata in the Oracle Spatial metadata.
INSERT INTO USER_SDO_GEOM_METADATA (TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)

VALUES (‘DEVICE', 'GEOMETRY',

MDSYS.SDO_DIM_ARRAY

(MDSYS.SDO_DIM_ELEMENT('X', 714099.913898663, 715312.343907550, 0.000000050),

MDSYS.SDO_DIM_ELEMENT('Y', 4908438.586694972, 4910715.465519385, 0.000000050) ),

82247);

COMMIT;
Create the spatial index of type point to use rotation.
CREATE INDEX device_idx ON DEVICE(Geometry)

INDEXTYPE IS MDSYS.SPATIAL_INDEX PARAMETERS ('layer_gtype=point');
Create the foreign key constraint defining the sub-feature.
alter table DEVICE

add constraint DEVICECABLE_FK

foreign key(LINKEDID)

references CABLE(ID)

ON DELETE CASCADE;