メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8875000 34.9250000, 136.8937500 34.9250000, 136.8937500 34.9291667, 136.8875000 34.9291667, 136.8875000 34.9250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral