メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395297211681 44.1763296690691, 142.393968662899 44.1761375304308, 142.394223243977 44.1753300816119, 142.395555836248 44.175530914022, 142.395297211681 44.1763296690691)) ^^http://www.opengis.net/ont/geosparql#wktLiteral