SDO_GEOMETRY type is very widely used, even by the open source community, which promotes the virtues of standards conformance and compliance, many in the geospatial industry still criticize Oracle's
SDO_GEOMETRY for its lack of perceived standards compliance. Whether this criticism is based on ignorance or maleficence,
SDO_GEOMETRY is standards compliant in its storage, geometry description, and with some functions, but its API is not fully compliant.
SDO_GEOMETRY is not the whole story. Oracle also provides an
ST_GEOMETRY object type, which is an implementation that is based on the ISO 13249-3, Information Technology – Database Language Spatial ...