メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8562500 31.3208334, 130.8625000 31.3208334, 130.8625000 31.3250000, 130.8562500 31.3250000, 130.8562500 31.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral