メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9500000 32.8250000, 129.9562500 32.8250000, 129.9562500 32.8291667, 129.9500000 32.8291667, 129.9500000 32.8250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral