メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8312500 26.4416667, 127.8375000 26.4416667, 127.8375000 26.4458334, 127.8312500 26.4458334, 127.8312500 26.4416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral