メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6937500 31.9125000, 130.7000000 31.9125000, 130.7000000 31.9166667, 130.6937500 31.9166667, 130.6937500 31.9125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral