メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9187500 26.9916667, 127.9250000 26.9916667, 127.9250000 26.9958334, 127.9187500 26.9958334, 127.9187500 26.9916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral