メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8625000 35.2708334, 136.8687500 35.2708334, 136.8687500 35.2750000, 136.8625000 35.2750000, 136.8625000 35.2708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral