メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8125000 26.3750000, 127.8187500 26.3750000, 127.8187500 26.3791667, 127.8125000 26.3791667, 127.8125000 26.3750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral