メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.908554652743 37.8437446968356, 138.90884919723 37.8438208268759, 138.909209217384 37.8439386847178, 138.909454714218 37.8440460985037, 138.909691382054 37.8441214404347, 138.909888725747 37.8441967779971, 138.909992208712 37.8442497753119, 138.909887388405 37.8444057090351, 138.909779846167 37.8445427864251, 138.909623467979 37.8447501428596, 138.909366909474 37.8450945517775, 138.909085793414 37.8454449571365, 138.908471161852 37.8451210249068, 138.907786147739 37.8447574868091, 138.907055488222 37.8443735539481, 138.906697539692 37.844179517878, 138.907227077344 37.8435697819645, 138.907506715134 37.843241069178, 138.907903375112 37.8434697405053, 138.908244081657 37.8436598941491, 138.908424063773 37.8437178384732, 138.908554652743 37.8437446968356)) ^^http://www.opengis.net/ont/geosparql#wktLiteral