メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9500000 27.6791667, 128.9562500 27.6791667, 128.9562500 27.6833333, 128.9500000 27.6833333, 128.9500000 27.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral