メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9312500 26.9125000, 127.9375000 26.9125000, 127.9375000 26.9166667, 127.9312500 26.9166667, 127.9312500 26.9125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral