メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9312500 26.2458334, 127.9375000 26.2458334, 127.9375000 26.2500000, 127.9312500 26.2500000, 127.9312500 26.2458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral