メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.2625000 42.2708334, 143.2687500 42.2708334, 143.2687500 42.2750000, 143.2625000 42.2750000, 143.2625000 42.2708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral