メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.5812500 33.3291667, 129.5875000 33.3291667, 129.5875000 33.3333333, 129.5812500 33.3333333, 129.5812500 33.3291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral