メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3250000 37.1458334, 140.3312500 37.1458334, 140.3312500 37.1500000, 140.3250000 37.1500000, 140.3250000 37.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral