メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4562500 43.0541667, 144.4625000 43.0541667, 144.4625000 43.0583333, 144.4562500 43.0583333, 144.4562500 43.0541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral