I don't think that using <p> would be a good practice in this case, as
these marks are not blocks of texts but merely separators.
In most cases <milestone/> with appropriate @unit and @rend will do the
job, although it may be not practical to use this element if you want to
encode the characters that form the mark.
There was a long discussion of this problem on this list in May 2012
under the subject " "content" of a <milestone> "... but I am not sure
everybody is satisfied with the result.
I wonder whether the relatively new <metamark> element could be used for
that purpose in document-oriented encoding schemas.
Selon Frédéric Glorieux:
> I do not know the right name for a "couillard" in English
> http://fr.wikipedia.org/wiki/Couillard_(typographie), and maybe a
> better term will be not as evocative as in French, but the thing is
> easy to understand. For example an asterism ⁂ is probably the most
> common kind of couillard.
> * *
> What should be a good practice to encode them ? This separator is not
> only an ornament but usually a logical separator between groups of
> paragraphs, so the separator should be kept (but the figure could be
> modified for a non imitative edition). The fast and easy way is to
> encode it as a common paragraph.
> <p rend="center"> *
> * *</p>
> Is there better ?