メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1250000 34.9208334, 136.1312500 34.9208334, 136.1312500 34.9250000, 136.1250000 34.9250000, 136.1250000 34.9208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral