メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.3651904009 43.7669760564936, 142.363700980163 43.7674179599807, 142.363417633642 43.7668990424888, 142.363104985246 43.7663264626859, 142.364603851806 43.7659151809943, 142.364905060691 43.7664670589317, 142.3651904009 43.7669760564936)) ^^http://www.opengis.net/ont/geosparql#wktLiteral