メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4687500 28.4000000, 129.4750000 28.4000000, 129.4750000 28.4041667, 129.4687500 28.4041667, 129.4687500 28.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral