メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9625000 26.6750000, 127.9687500 26.6750000, 127.9687500 26.6791667, 127.9625000 26.6791667, 127.9625000 26.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral