メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.970257233697 43.5353128938814, 144.969399201035 43.5347521013141, 144.970124698889 43.5341334301953, 144.970217778266 43.5340540035236, 144.971105625424 43.5346287763947, 144.971017447972 43.53470116066, 144.970257233697 43.5353128938814)) ^^http://www.opengis.net/ont/geosparql#wktLiteral