code: public static void setEncoding (@Nonnull final Marshaller aMarshaller, @Nullable final String sEncoding)
    {
      _setProperty (aMarshaller, Marshaller.JAXB_ENCODING, sEncoding);
    }
docs: Set the standard property for the encoding charset.
  
  @param aMarshaller
  The marshaller to set the property. May not be <code>null</code>.
  @param sEncoding
  the value to be set