メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.2375000 31.8208334, 130.2437500 31.8208334, 130.2437500 31.8250000, 130.2375000 31.8250000, 130.2375000 31.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral