[Intropy]

The data structure could be like this: "Sport"+"League"+"Season"+"Week"+"Game". Here you can see an example with different kind of sports:

I think the sport is a good piece of metadata, but I don't think it ought to be atop a hierarchy like that. If you split it by sport at the top, then you'd end up with something like the Olympic events being split up into many different categories when logically you probably think of them together.

One important piece of data that I haven't seen mentioned in video source. Ultimately we're describing videos not events. Obviously data about the event being recorded is paramount. But NBC's broadcast of the 2012 Olympics Men's beach volleyball final is different from the BBC's, and those are much different from CCTV's. Even within more local leagues the particular broadcast matters. For example NFL preseason games use local commentators, so there are two different broadcasts, one for each team's city. Actually that brings up an even more complex issue. What do you do about broadcasts that differ only in audio?

One other point worth a little thought is how you disambiguate women's vs men's sports when everything else about the names is the same. Usually the league is sex-specific, but again you get something like the Olympics where there is a women's luge final as well as a men's luge final.