メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912520559988 43.4854064791809, 141.911856899328 43.4855094774168, 141.911722533947 43.4853146659585, 141.91165383936 43.4851425537517, 141.911401063174 43.4842911187562, 141.912176887006 43.4841761474692, 141.912424114723 43.485032874416, 141.912520559988 43.4854064791809)) ^^http://www.opengis.net/ont/geosparql#wktLiteral