メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6250000 35.2375000, 136.6312500 35.2375000, 136.6312500 35.2416667, 136.6250000 35.2416667, 136.6250000 35.2375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral