メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346246573395 44.4860236233132, 142.345945572898 44.4859473399684, 142.345114655661 44.4857367426019, 142.345527838876 44.4850012458052, 142.346628066723 44.4852462762763, 142.346246573395 44.4860236233132)) ^^http://www.opengis.net/ont/geosparql#wktLiteral