メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8812500 33.4250000, 129.8875000 33.4250000, 129.8875000 33.4291667, 129.8812500 33.4291667, 129.8812500 33.4250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral