I came up with an idea for a small feature that I believe would make a useful addition to ghc-pkg and Cabal. I'm willing to implement it myself, but I have had some previous experiences with other projects where I did some work and then the maintainers said "sorry, not interested", so I want to gauge interest before I start. I've already posted to glasgow-haskell-users, where Simon Marlow was kind enough to respond; he suggested that before starting work I should also get people's opinions here. The feature itself is this: Arbitrary key-value pairs in Cabal package files and the installed-package database. The use-case is for an application supporting plugins to discover installed plugins compatible with it, interrogating these fields through the GHC API. For example, my content-management system FruitTart could enumerate the list of installed packages looking for packages which export a field "fruit-tart-plugin-interface-version" with a numeric value matching the interface version it's expecting. Once again, I'm not asking anyone to do this work for me - I'm eager to get my hands dirty and do it myself. I just want to find out what the process would be to get it accepted, once it works. Thanks in advance, -- Dan Knapp "An infallible method of conciliating a tiger is to allow oneself to be devoured." (Konrad Adenauer)