メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.756315519162 42.8912411250677, 140.755004713232 42.8913250901159, 140.753958742334 42.8913899220182, 140.753852154247 42.890428997234, 140.753754071225 42.8895437898075, 140.755467130171 42.8894517181259, 140.755940820554 42.8901240796781, 140.756329180816 42.8907180336184, 140.756315519162 42.8912411250677)) ^^http://www.opengis.net/ont/geosparql#wktLiteral