/// <summary>
 /// Adds a Triple to the base collection.
 /// </summary>
 /// <param name="t">Triple to add.</param>
 protected internal override bool Add(Triple t)
 {
     return(_baseCollection.Add(t));
 }
 /// <summary>
 /// Adds a triple to the collection.
 /// </summary>
 /// <param name="t">Triple.</param>
 /// <returns></returns>
 protected internal override bool Add(Triple t)
 {
     return(_triples.Add(t));
 }