メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.4562500 42.9291667, 143.4625000 42.9291667, 143.4625000 42.9333333, 143.4562500 42.9333333, 143.4562500 42.9291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral