メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.342028966904 43.7970695896461, 142.34095503979 43.7978844405535, 142.339203304902 43.7967087717315, 142.339622943785 43.7964062540884, 142.340002728459 43.7961414575623, 142.340375014038 43.7958864578744, 142.342028966904 43.7970695896461)) ^^http://www.opengis.net/ont/geosparql#wktLiteral