メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8000000 35.3000000, 136.8062500 35.3000000, 136.8062500 35.3041667, 136.8000000 35.3041667, 136.8000000 35.3000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral