メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4500000 31.4041667, 130.4562500 31.4041667, 130.4562500 31.4083333, 130.4500000 31.4083333, 130.4500000 31.4041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral