メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.372205513751 43.7669138759264, 142.372511588179 43.7674483118494, 142.371027349667 43.7678767617368, 142.370724193734 43.7673415840874, 142.370421032848 43.7667939392326, 142.371906406624 43.7663681985069, 142.372205513751 43.7669138759264)) ^^http://www.opengis.net/ont/geosparql#wktLiteral