メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8125000 38.7125000, 140.8187500 38.7125000, 140.8187500 38.7166667, 140.8125000 38.7166667, 140.8125000 38.7125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral