http://ibcf6qlyirfnc6vcfuv4y7k6oowwqz4jmcjbrkxov43feyqj6cnyvcqd.onion/comas/general/proposals/54.html
The Debtags effort is developing a powerful and flexible system to attach "tags" to packages, which allow us to explicit some of their attributes, making them available to automated tools such as package managers and web interfaces. Example uses of Debtags are package search, browsing the archive, filtering out classes of packages like auto-installed shared libraries or localization packages specific to locales other than the ones compiled in the system.