メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402433428236 44.1663373135256, 142.400913069629 44.1660988209845, 142.400849315417 44.1660892003445, 142.401338914989 44.1644832812557, 142.402564732833 44.1646662580572, 142.402825978441 44.1648603561376, 142.402897467769 44.1648501693586, 142.402433428236 44.1663373135256)) ^^http://www.opengis.net/ont/geosparql#wktLiteral