メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8062500 26.3250000, 127.8125000 26.3250000, 127.8125000 26.3291667, 127.8062500 26.3291667, 127.8062500 26.3250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral