メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912242662784 43.4969672002679, 141.910703812521 43.4972153917183, 141.91048301137 43.4965571828288, 141.910348708697 43.4961457960694, 141.911892517483 43.4959221318402, 141.911948228347 43.4959140691109, 141.912242662784 43.4969672002679)) ^^http://www.opengis.net/ont/geosparql#wktLiteral