メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.345536953755 44.4875030280478, 142.34464021182 44.4872681192437, 142.344881708089 44.4867454986963, 142.345772054307 44.4869777740134, 142.345536953755 44.4875030280478)) ^^http://www.opengis.net/ont/geosparql#wktLiteral