メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.126906853748 42.9799768351414, 144.126119689196 42.9808649183355, 144.123332478898 42.9795952203341, 144.124119955553 42.9786471600482, 144.125280849142 42.9792087064523, 144.126906853748 42.9799768351414)) ^^http://www.opengis.net/ont/geosparql#wktLiteral