メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350779321813 43.7756721579434, 142.351013628908 43.7760992519917, 142.349592033129 43.7765144392286, 142.349334621731 43.7760840040342, 142.349114211394 43.7756602320437, 142.350542736179 43.7752500923536, 142.350779321813 43.7756721579434)) ^^http://www.opengis.net/ont/geosparql#wktLiteral