メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6125000 27.3791667, 128.6187500 27.3791667, 128.6187500 27.3833333, 128.6125000 27.3833333, 128.6125000 27.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral