メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.6937500 26.0916667, 127.7000000 26.0916667, 127.7000000 26.0958334, 127.6937500 26.0958334, 127.6937500 26.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral