メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.337096255486 43.0685003507057, 141.335629944366 43.0690988779721, 141.335803762654 43.0683118770653, 141.337096255486 43.0685003507057)) ^^http://www.opengis.net/ont/geosparql#wktLiteral