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