メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7187500 26.1250000, 127.7250000 26.1250000, 127.7250000 26.1291667, 127.7187500 26.1291667, 127.7187500 26.1250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral