メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.018258531854 37.7598701601357, 139.018266594399 37.7601357851124, 139.018059439794 37.7601433151141, 139.018035461449 37.7598776177949, 139.018258531854 37.7598701601357)) ^^http://www.opengis.net/ont/geosparql#wktLiteral