code: @Nonnull
    public final Validator getValidator (@Nonnull @Nonempty final IReadableResource... aResources)
    {
      return getValidatorFromSchema (getSchema (aResources));
    }
docs: Get a new validator based on the {@link Schema} that consists of multiple
  resources.
  
  @param aResources
  The resources to parse into a single {@link Schema}. May neither
  <code>null</code> nor empty nor may it contain <code>null</code>
  elements.
  @return A new {@link Validator} object. Never <code>null</code>.
  @see #getSchema(IReadableResource...)