メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421254895874 43.8249620902304, 142.42007860408 43.8241139682322, 142.419592441663 43.8237366700827, 142.422005496022 43.8219823535838, 142.42368646632 43.8231943280717, 142.421254895874 43.8249620902304)) ^^http://www.opengis.net/ont/geosparql#wktLiteral