メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.425606212137 43.8120427594707, 142.424197236355 43.813230433819, 142.422524685717 43.8146221050258, 142.420047132662 43.8117930021337, 142.419469322801 43.8111296106275, 142.419117291195 43.8107254292094, 142.419086244208 43.8106935070974, 142.420726870432 43.8093255480468, 142.420943743034 43.8091187458383, 142.425606212137 43.8120427594707)) ^^http://www.opengis.net/ont/geosparql#wktLiteral