メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6562500 28.4375000, 129.6625000 28.4375000, 129.6625000 28.4416667, 129.6562500 28.4416667, 129.6562500 28.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral