メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7562500 35.2000000, 136.7625000 35.2000000, 136.7625000 35.2041667, 136.7562500 35.2041667, 136.7562500 35.2000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral