メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.373138943103 43.7653731445511, 142.373451667246 43.7659313394657, 142.373437752552 43.7659352572277, 142.371906406624 43.7663681985069, 142.371603457593 43.7658154927484, 142.371280341135 43.7652260287822, 142.372815225935 43.7647850209467, 142.373138943103 43.7653731445511)) ^^http://www.opengis.net/ont/geosparql#wktLiteral