メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.796472311828 35.4430540009505, 136.794487014676 35.4427750839672, 136.795874651709 35.4394593920092, 136.796631171943 35.4395835267767, 136.796906360606 35.4396286715754, 136.796951759771 35.4396361004586, 136.796472311828 35.4430540009505)) ^^http://www.opengis.net/ont/geosparql#wktLiteral