メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.982765550659 43.5600638305327, 144.982328537638 43.5597701562352, 144.983281347059 43.5590003014445, 144.983760449925 43.5592796738357, 144.982765550659 43.5600638305327)) ^^http://www.opengis.net/ont/geosparql#wktLiteral