メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346925437085 43.7719102077157, 142.347122510502 43.7718874831537, 142.347263284072 43.7723790824004, 142.345632296935 43.7727947301197, 142.345432597754 43.7720988934932, 142.345300848342 43.7715161459166, 142.346782437771 43.7712928043755, 142.346925437085 43.7719102077157)) ^^http://www.opengis.net/ont/geosparql#wktLiteral