What's my tagging option under Linux XMonad [on hold]

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http://stackoverflow.com – I know the famous Nepomuk, but it seems to only work under KDE. I also see some webpages suggesting Beagle, but it doesn't seem to be under development anymore. So what's my choice if I'd like to tag my files and search for my tags like I did with mdfind under OSX? (HowTos)