メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.352777371411 43.1504200429983, 141.352125532407 43.1504804798581, 141.350642874406 43.1506491648982, 141.350568751098 43.1503126231755, 141.350338090365 43.1493316269813, 141.351798185333 43.149166843898, 141.352462488667 43.1490807656259, 141.352468093608 43.1491178729344, 141.352777371411 43.1504200429983)) ^^http://www.opengis.net/ont/geosparql#wktLiteral