メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914385960678 43.5093036436064, 141.912426857816 43.5096037888096, 141.911863840751 43.5077460423302, 141.913783323155 43.5074719879571, 141.913968836395 43.5080810662494, 141.914375942781 43.5092633170407, 141.914385960678 43.5093036436064)) ^^http://www.opengis.net/ont/geosparql#wktLiteral