メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9812500 32.7500000, 129.9875000 32.7500000, 129.9875000 32.7541667, 129.9812500 32.7541667, 129.9812500 32.7500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral