メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7875000 35.8000000, 140.7937500 35.8000000, 140.7937500 35.8041667, 140.7875000 35.8041667, 140.7875000 35.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral