メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.129474290153 42.9720845824844, 144.129076145796 42.9719486354597, 144.128003430919 42.9716000440253, 144.12674055222 42.9711514597186, 144.127713133416 42.9700539167297, 144.128095046599 42.9702108821136, 144.129834438445 42.9707905939694, 144.130255088755 42.9709675926011, 144.129474290153 42.9720845824844)) ^^http://www.opengis.net/ont/geosparql#wktLiteral