For now, <author> and <editor> may use the attribute @role, contrarily to <publisher>.
This may provoke different ways of encoding the same kind of information for these metadata (I think first of all about the <monogr> part in the teiHeader with this feature request).
Some will use, @role attributed to a name/persName within <publisher>, some will use resp/respStmt, and those who would prefer @role can only do it with <author> and <editor>.
Authorizing this attribute to <publisher> would permit to precise some responsibilities, especially printer and bookseller in a hierarchical and semantical way, as their relationship may be important for some projects such as the Bibliothèques Virtuelles Humanistes.
One example :
- L'olive, 1550, Author ; Joachim du Bellay. Printer : Menier, Maurice. Booksellers : Corrozet, Gilles & L'angelier Arnoul