メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.900526734502 43.4747910078712, 141.899098552498 43.4750105700232, 141.898774027427 43.4739893834957, 141.898676309484 43.4736527232464, 141.898203594858 43.4721106814709, 141.89870370795 43.4719951909038, 141.898893178502 43.4719633155966, 141.899656736952 43.4718387783063, 141.899843238501 43.4724717387472, 141.90024568516 43.4738200986264, 141.900526734502 43.4747910078712)) ^^http://www.opengis.net/ont/geosparql#wktLiteral