メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8125000 35.2416667, 136.8187500 35.2416667, 136.8187500 35.2458334, 136.8125000 35.2458334, 136.8125000 35.2416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral