メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3187500 38.8666667, 141.3250000 38.8666667, 141.3250000 38.8708334, 141.3187500 38.8708334, 141.3187500 38.8666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral