メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.3125000 35.7291667, 137.3187500 35.7291667, 137.3187500 35.7333333, 137.3125000 35.7333333, 137.3125000 35.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral