メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4937500 28.4041667, 129.5000000 28.4041667, 129.5000000 28.4083333, 129.4937500 28.4083333, 129.4937500 28.4041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral