メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39850649076 44.1886214618738, 142.397034614612 44.18838425094, 142.397178131218 44.1878949830708, 142.398659444886 44.1881263422356, 142.39850649076 44.1886214618738)) ^^http://www.opengis.net/ont/geosparql#wktLiteral