メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.815765794944 35.3714167952943, 136.813154382235 35.3708996734137, 136.813432354288 35.3699668478245, 136.813780770266 35.368703872429, 136.816451501532 35.369022077224, 136.816049232334 35.3704708105882, 136.815765794944 35.3714167952943)) ^^http://www.opengis.net/ont/geosparql#wktLiteral