メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.910702537759 43.4818013060413, 141.909644290558 43.4820028084578, 141.909273842722 43.4807272461015, 141.909405352616 43.480706645661, 141.909585896244 43.4806781029183, 141.910335616681 43.4805640466577, 141.910702537759 43.4818013060413)) ^^http://www.opengis.net/ont/geosparql#wktLiteral