メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8000000 31.8875000, 130.8062500 31.8875000, 130.8062500 31.8916667, 130.8000000 31.8916667, 130.8000000 31.8875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral