メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.768930372706 43.2106833559162, 141.767879471769 43.2112192008794, 141.767382253289 43.2105875950978, 141.767684506596 43.2104766254587, 141.767854608311 43.2103648168508, 141.768338648209 43.2100984117019, 141.768930372706 43.2106833559162)) ^^http://www.opengis.net/ont/geosparql#wktLiteral