メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.058948750675 42.9065526976027, 143.058561361777 42.9064938911423, 143.058176979139 42.9064672741722, 143.057338324047 42.9063955386759, 143.057485227468 42.9055931298951, 143.058209361975 42.9060608031117, 143.058948750675 42.9065526976027)) ^^http://www.opengis.net/ont/geosparql#wktLiteral