AIMA.Core.Learning.Framework.DataSet.emptyDataSet C# (CSharp) Method

        public DataSet emptyDataSet()
        {
            return new DataSet(specification);
        }

 public DataSet unmatchedExamples(DataSet ds)
 {
     DataSet unmatched = ds.emptyDataSet();
     foreach (Example e in ds.examples)
     {
         if (!(matches(e)))
         {
             unmatched.add(e);
         }
     }
     return unmatched;
 }