メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.052538364605 42.9000567214191, 143.052405821291 42.9000456930021, 143.051926864888 42.9000259758893, 143.051926711292 42.8999182258122, 143.052051809301 42.8989648256061, 143.052522640175 42.900031863522, 143.052538364605 42.9000567214191)) ^^http://www.opengis.net/ont/geosparql#wktLiteral