メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1187500 26.6000000, 128.1250000 26.6000000, 128.1250000 26.6041667, 128.1187500 26.6041667, 128.1187500 26.6000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral