メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908814207467 43.4908648695445, 141.907988292842 43.4910121351158, 141.907631343238 43.4898353871397, 141.907614575998 43.4897817134578, 141.907786230309 43.4897575756205, 141.907809386945 43.4898088783561, 141.908496838052 43.4897103220052, 141.908697373335 43.4904427731265, 141.908814207467 43.4908648695445)) ^^http://www.opengis.net/ont/geosparql#wktLiteral