メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904953169071 43.4841135708104, 141.904061165397 43.4842467226746, 141.90386293894 43.4835783225418, 141.903753783099 43.4831874807566, 141.903767055828 43.4828780216442, 141.904538687591 43.4827521755097, 141.90490320861 43.4838746337132, 141.904953169071 43.4841135708104)) ^^http://www.opengis.net/ont/geosparql#wktLiteral