メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.9500000 37.4000000, 136.9562500 37.4000000, 136.9562500 37.4041667, 136.9500000 37.4041667, 136.9500000 37.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral