メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9500000 36.3583333, 137.9562500 36.3583333, 137.9562500 36.3625000, 137.9500000 36.3625000, 137.9500000 36.3583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral