メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6750000 34.9125000, 135.6812500 34.9125000, 135.6812500 34.9166667, 135.6750000 34.9166667, 135.6750000 34.9125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral