メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.039904042774 43.5743319668754, 142.039752593001 43.5744166156662, 142.039522321254 43.5743728489441, 142.039687792421 43.5739472873667, 142.0399496332 43.573273858383, 142.040715065544 43.5738445045649, 142.040447915566 43.5739982540379, 142.040193139014 43.5741676377026, 142.039904042774 43.5743319668754)) ^^http://www.opengis.net/ont/geosparql#wktLiteral