'Valid keys to append to the data.keys() list.'

def _additional_keys(self):

    addkeys = []
    if self.data.has_key('name'):
        addkeys += ['canonical    name', 'long    imdb    name', 'long    imdb    canonical    name']
    if self.data.has_key('headshot'):
        addkeys += ['full-size    headshot']
    return addkeys
