メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4687500 35.8416667, 136.4750000 35.8416667, 136.4750000 35.8458334, 136.4687500 35.8458334, 136.4687500 35.8416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral