'This sitemap object initializes on a feed dictionary (as would be passed
to `django.contrib.gis.views.feed`) and a slug dictionary.
If the slug dictionary is not defined, then it\'s assumed the keys provide
the URL parameter to the feed.  However, if you have a complex feed (e.g.,
you override `get_object`, then you\'ll need to provide a slug dictionary.
The slug dictionary should have the same keys as the feed dictionary, but
each value in the slug dictionary should be a sequence of slugs that may
be used for valid feeds.  For example, let\'s say we have a feed that
returns objects for a specific ZIP code in our feed dictionary:
feed_dict = {\'zipcode\' : ZipFeed}
Then we would use a slug dictionary with a list of the zip code slugs
corresponding to feeds you want listed in the sitemap:
slug_dict = {\'zipcode\' : [\'77002\', \'77054\']}'

def __init__(self, feed_dict, slug_dict=None):

    self.feed_dict = feed_dict
    self.locations = []
    if (slug_dict is None):
        slug_dict = {}
    for section in feed_dict.keys():
        if slug_dict.get(section, False):
            for slug in slug_dict[section]:
                self.locations.append(('%s/%s' % (section, slug)))
        else:
            self.locations.append(section)
