メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8250000 26.3916667, 127.8312500 26.3916667, 127.8312500 26.3958334, 127.8250000 26.3958334, 127.8250000 26.3916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral