メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5812500 31.1708334, 130.5875000 31.1708334, 130.5875000 31.1750000, 130.5812500 31.1750000, 130.5812500 31.1708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral