メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.293792633327 43.1142669849129, 141.292827279605 43.1147799165472, 141.291257274896 43.1131928953184, 141.292654908418 43.1121848891429, 141.292974989149 43.1124778117156, 141.293699283705 43.1131168918762, 141.294511210362 43.1138748507195, 141.293792633327 43.1142669849129)) ^^http://www.opengis.net/ont/geosparql#wktLiteral