メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6562500 35.3458334, 136.6625000 35.3458334, 136.6625000 35.3500000, 136.6562500 35.3500000, 136.6562500 35.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral