On 12/5/2012 10:12 PM, Daniel Holth wrote:
Makes sense. How about calling it Replacement. 0 or 1?

Replacement (optional)
::::::::::::::::::::::

Indicates that this project is no longer being developed.  The named
project provides a drop-in replacement.

A version declaration may be supplied and must follow the rules described
in `Version Specifiers`_.

The most common use of this field will be in case a project name changes.

Examples::

     Name: BadName
     Replacement: AcceptableName

     Replacement: AcceptableName (>=4.0.0)

I like it. 'Replacement' is broader in meaning, more neutral, and less awkward than 'Obsoleted-by'. And I agree that A users have much more need to know about B the vice-versa. It is much the same situation with Py 2 and Py 3 (although the latter is *not* a drop-in replacement).

--
Terry Jan Reedy

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