メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.464720644138 43.4715924784186, 142.463391627078 43.4722073593451, 142.461864901216 43.4729210087467, 142.460466720629 43.4735665385587, 142.459465248572 43.4720367569503, 142.462149097933 43.4708036152283, 142.463484890735 43.4701714011449, 142.464339674233 43.4711543854365, 142.464720644138 43.4715924784186)) ^^http://www.opengis.net/ont/geosparql#wktLiteral