メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2500000 35.8875000, 136.2562500 35.8875000, 136.2562500 35.8916667, 136.2500000 35.8916667, 136.2500000 35.8875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral