メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4187500 34.7750000, 134.4250000 34.7750000, 134.4250000 34.7791667, 134.4187500 34.7791667, 134.4187500 34.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral