メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7375000 35.1125000, 136.7437500 35.1125000, 136.7437500 35.1166667, 136.7375000 35.1166667, 136.7375000 35.1125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral