メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8000000 34.9250000, 135.8062500 34.9250000, 135.8062500 34.9291667, 135.8000000 34.9291667, 135.8000000 34.9250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral