メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402480399922 44.1715047722366, 142.401747719548 44.1713997404275, 142.400958994081 44.1712866752907, 142.40097432217 44.171239647239, 142.400987437712 44.171191974058, 142.40123190255 44.1704295606188, 142.402738398906 44.1706612290979, 142.402480399922 44.1715047722366)) ^^http://www.opengis.net/ont/geosparql#wktLiteral