メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.127685927181 43.5411954658019, 142.123870252639 43.5410031177527, 142.124310810886 43.5370936622496, 142.127609316749 43.5373565086011, 142.12709429887 43.5406536883553, 142.127093706699 43.5409440877294, 142.127117718385 43.541032122457, 142.127685927181 43.5411954658019)) ^^http://www.opengis.net/ont/geosparql#wktLiteral