メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.415386520623 43.7878152139048, 142.414325170185 43.7871420042877, 142.413283295285 43.7864874280278, 142.414518882516 43.7854144792725, 142.415566544185 43.7861049550544, 142.416602538881 43.7867727747351, 142.415386520623 43.7878152139048)) ^^http://www.opengis.net/ont/geosparql#wktLiteral