I gotta agree with SyntaxE I don't know whether it is symbolical as well but my Uncle died as well and I always think of him when I hear this song and it always gets me crying....
I don't know if this song is meant symbolical or not.. But my uncle died a few years ago and this song reminds me of it, of all the emotion and pain and at the same time the beauty of human love.. I guess this is my favorite Vienna song