From: Saašha Metsärantala
> Are there some reasons not to allow the occurrence of displayForm and
> instead require that the etal element should be empty? What I wonder is:
> Are there big enough semantic differences between the text content of the
> displayForm element and that of the intended etal element to put this text
> in two different elements?
<displayForm> does have existing semantics that could possibly conflict with the purpose here, whereas <etal> does not have any pre-existing semantics.
<displayForm> for example is used to facilitate display of personal names in direct order rather than inverted.