メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4562500 42.9458334, 144.4625000 42.9458334, 144.4625000 42.9500000, 144.4562500 42.9500000, 144.4562500 42.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral