I was trying to load one Fixture file, but I didn't find a way to do this. currently Doctrine\Common\DataFixtures\Loader has only loadFromDirectory() method. we can refactor part of it and put it into another method to allow loading from files.
if you don't have a reason that can stop us from having a loadFromFile() method, just inform me and I will start working on the refactoring and will send you a pull request.
I need this to update DoctrineFixturesBundle to be able to load from files too.
A pull request exists for this now: #79
It was merged, this issue can be closed.