メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9250000 30.5291667, 130.9312500 30.5291667, 130.9312500 30.5333333, 130.9250000 30.5333333, 130.9250000 30.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral