メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.345772054307 44.4869777740134, 142.344881708089 44.4867454986963, 142.345089484681 44.4862930065594, 142.345713172233 44.4864549089712, 142.346021304383 44.4865349133975, 142.345772054307 44.4869777740134)) ^^http://www.opengis.net/ont/geosparql#wktLiteral