Not clear about the dot notation

[Zeynel]

What does vote.vote refer to in this snippet?

    def txn():
        quote = Quote.get_by_id(quote_id)
        vote = Vote.get_by_key_name(key_names = user.email(), parent =
quote)
        if vote is None:
            vote = Vote(key_name = user.email(), parent = quote)
        if vote.vote == newvote:
            return
        quote.votesum = quote.votesum - vote.vote + newvote
        vote.vote = newvote

from here: http://code.google.com/appengine/articles/overheard.html