メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.415344230569 43.822091403475, 142.413770646628 43.8231998586403, 142.412115092297 43.8220263475677, 142.414588321196 43.8202265095648, 142.41627169176 43.8213795870149, 142.415344230569 43.822091403475)) ^^http://www.opengis.net/ont/geosparql#wktLiteral