メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4687500 31.2541667, 130.4750000 31.2541667, 130.4750000 31.2583333, 130.4687500 31.2583333, 130.4687500 31.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral