メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9500000 35.0000000, 137.9562500 35.0000000, 137.9562500 35.0041667, 137.9500000 35.0041667, 137.9500000 35.0000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral