メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7187500 35.1375000, 135.7250000 35.1375000, 135.7250000 35.1416667, 135.7187500 35.1416667, 135.7187500 35.1375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral