メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.5437500 38.8666667, 141.5500000 38.8666667, 141.5500000 38.8708334, 141.5437500 38.8708334, 141.5437500 38.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral