メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9625000 26.3500000, 127.9687500 26.3500000, 127.9687500 26.3541667, 127.9625000 26.3541667, 127.9625000 26.3500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral