My definition is over-simplified, but I've found that I when I take snapshots during vacations, shoot photos for others (never done commercial work and that has never appealed to me) versus art for art's sake, it comes down to either a bald document of what I saw or "art". You could go on forever about aesthetic principles and how and whether they can be applied in similar ways to either category, but for me, it just comes down to how it feels, how I value the experience. I paint, draw and make litho prints. Those are never documents, while most of my photos are documents, though I spend far more time thinking about making art.
Yeah, I see your point. My definition of "document" or "documentation" is too broad. Perhaps.