メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4875000 33.5500000, 135.4937500 33.5500000, 135.4937500 33.5541667, 135.4875000 33.5541667, 135.4875000 33.5500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral