メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.355360542388 45.1238769749547, 142.355642971251 45.1239068693395, 142.356612824975 45.1240303945076, 142.357649222526 45.1241682606028, 142.357435361651 45.1250744129468, 142.357216649451 45.1258538811662, 142.356161421699 45.1257120226896, 142.355452432957 45.1256208709341, 142.354757527043 45.1255315302504, 142.353707793365 45.1253732621156, 142.353904414524 45.1245516387948, 142.354140619856 45.1237178854874, 142.354971532968 45.1238282652568, 142.355360542388 45.1238769749547)) ^^http://www.opengis.net/ont/geosparql#wktLiteral