メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6125000 38.1166667, 140.6187500 38.1166667, 140.6187500 38.1208334, 140.6125000 38.1208334, 140.6125000 38.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral