メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9687500 26.6125000, 127.9750000 26.6125000, 127.9750000 26.6166667, 127.9687500 26.6166667, 127.9687500 26.6125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral