メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4625000 34.7291667, 135.4687500 34.7291667, 135.4687500 34.7333333, 135.4625000 34.7333333, 135.4625000 34.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral