メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.886721565563 43.0117289325411, 142.886294038946 43.0120952603376, 142.885118184514 43.011344048881, 142.885546285264 43.0110053625404, 142.886721565563 43.0117289325411)) ^^http://www.opengis.net/ont/geosparql#wktLiteral