メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.3812500 34.6625000, 137.3875000 34.6625000, 137.3875000 34.6666667, 137.3812500 34.6666667, 137.3812500 34.6625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral