メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.2500000 34.1291667, 129.2562500 34.1291667, 129.2562500 34.1333333, 129.2500000 34.1333333, 129.2500000 34.1291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral