メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7062500 34.5000000, 136.7125000 34.5000000, 136.7125000 34.5041667, 136.7062500 34.5041667, 136.7062500 34.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral