メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.810641658271 34.0546202362099, 131.810105884496 34.0548280163418, 131.809381435951 34.0535337661481, 131.809915206279 34.0533220360769, 131.810641658271 34.0546202362099)) ^^http://www.opengis.net/ont/geosparql#wktLiteral