メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.9187500 35.8375000, 136.9250000 35.8375000, 136.9250000 35.8416667, 136.9187500 35.8416667, 136.9187500 35.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral