メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4500000 38.5208334, 141.4562500 38.5208334, 141.4562500 38.5250000, 141.4500000 38.5250000, 141.4500000 38.5208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral