メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3625000 38.8500000, 141.3687500 38.8500000, 141.3687500 38.8541667, 141.3625000 38.8541667, 141.3625000 38.8500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral