メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8312500 31.4000000, 130.8375000 31.4000000, 130.8375000 31.4041667, 130.8312500 31.4041667, 130.8312500 31.4000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral