メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396485657215 44.1816308918185, 142.395680693657 44.1814980688498, 142.395289602307 44.1814335392788, 142.395818819334 44.1797042841851, 142.397015799855 44.1798984980412, 142.396485657215 44.1816308918185)) ^^http://www.opengis.net/ont/geosparql#wktLiteral