メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.330838055843 43.0899528763477, 141.332170134246 43.0901157741302, 141.331974609862 43.0909996418356, 141.331221365351 43.0909127111275, 141.330371635553 43.0908352659677, 141.330455507756 43.0905079979253, 141.330579773066 43.0899244955631, 141.330838055843 43.0899528763477)) ^^http://www.opengis.net/ont/geosparql#wktLiteral