メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.5500000 27.3291667, 128.5562500 27.3291667, 128.5562500 27.3333333, 128.5500000 27.3333333, 128.5500000 27.3291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral