メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.773746216635 43.1978289919472, 141.773189839014 43.1984225726918, 141.772173849533 43.1978985517348, 141.772679307396 43.1973888067066, 141.772772932717 43.1972962937605, 141.773746216635 43.1978289919472)) ^^http://www.opengis.net/ont/geosparql#wktLiteral