メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3312500 35.8916667, 136.3375000 35.8916667, 136.3375000 35.8958334, 136.3312500 35.8958334, 136.3312500 35.8916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral