role signatures in libraries

Henning Thielemann lemming at
Wed Nov 27 18:18:56 UTC 2013

On Wed, 27 Nov 2013, Richard Eisenberg wrote:

> It seems that the syntax and semantics of role annotations has settled, 
> and so it's time to add role annotations to various libraries.

This topic is completely new to me. Where can I read what it is about, 
what is its motivation?

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