メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7000000 37.1500000, 136.7062500 37.1500000, 136.7062500 37.1541667, 136.7000000 37.1541667, 136.7000000 37.1500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral