メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2500000 38.7208334, 141.2562500 38.7208334, 141.2562500 38.7250000, 141.2500000 38.7250000, 141.2500000 38.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral