メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.105898967787 43.8190743292751, 144.104583006352 43.8194815971693, 144.104320399612 43.8190363445761, 144.105633997743 43.8186595833658, 144.105898967787 43.8190743292751)) ^^http://www.opengis.net/ont/geosparql#wktLiteral