メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.5812500 35.1458334, 134.5875000 35.1458334, 134.5875000 35.1500000, 134.5812500 35.1500000, 134.5812500 35.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral