メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.649004558083 42.827294249786, 141.648519145211 42.8276842966286, 141.646676561611 42.8292060183402, 141.646568219962 42.8291109896093, 141.646124528357 42.8287220984867, 141.647913067876 42.8272798580844, 141.647569665479 42.8270281565524, 141.648108180693 42.8265816338228, 141.649077411112 42.8272356932929, 141.649004558083 42.827294249786)) ^^http://www.opengis.net/ont/geosparql#wktLiteral