code: @Nonnull
    public final ValidationExecutionManager addExecutors (@Nullable final IValidationExecutor... aExecutors)
    {
      if (aExecutors != null)
        for (final IValidationExecutor aExecutor : aExecutors)
          addExecutor (aExecutor);
      return this;
    }
docs: Add 0-n executors at once.
  
  @param aExecutors
  The executors to be added. May be <code>null</code> but may not
  contain <code>null</code> values.
  @return this for chaining
  @see #addExecutor(IValidationExecutor)