メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378931755865 43.7838848681506, 142.378218235537 43.7840861654401, 142.37749917998 43.7842994720196, 142.376994538946 43.7833354505101, 142.377669550968 43.7831305289065, 142.378411878655 43.7829255108143, 142.378926187764 43.7838688233087, 142.378931755865 43.7838848681506)) ^^http://www.opengis.net/ont/geosparql#wktLiteral