メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5000000 31.4291667, 130.5062500 31.4291667, 130.5062500 31.4333333, 130.5000000 31.4333333, 130.5000000 31.4291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral