メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.883017163609 43.0194294707503, 142.882616840681 43.0197919759896, 142.881425006433 43.0190211933745, 142.881801684384 43.018693916976, 142.882428452628 43.019078751027, 142.883017163609 43.0194294707503)) ^^http://www.opengis.net/ont/geosparql#wktLiteral