メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.295456253215 40.5778709344176, 140.294819841118 40.5781888477041, 140.294729608748 40.5782097444584, 140.294084683215 40.577483186275, 140.294748311059 40.5771199183466, 140.295456253215 40.5778709344176)) ^^http://www.opengis.net/ont/geosparql#wktLiteral