From jmc at r-project.org  Thu Jul 21 19:29:39 2011
From: jmc at r-project.org (John Chambers)
Date: Thu, 21 Jul 2011 10:29:39 -0700
Subject: [Rd] Same class name, different package
Message-ID: <4E286203.8070104@r-project.org>

In principle, two separately developed packages could use the same class 
name, and a user could then attach both and attempt to use methods for 
both classes.

That has never worked, but some changes have been added to r-devel to 
handle this case.  The changes involve extending the "signature" class 
to include package information.  For compatibility, packages will need 
to be re-installed from a version of R labelled 56466 or later, although 
an attempt is made to fill in missing information.

John



[Rd] Same class name, different package
John Chambers