# documentación de Django - 1.10.7

# Código fuente para django.contrib.flatpages.sitemaps

    from django.apps import apps as django_apps
    from django.contrib.sitemaps import Sitemap
    from django.core.exceptions import ImproperlyConfigured

    class FlatPageSitemap(Sitemap):
        def items(self):
            if not django_apps.is_installed('django.contrib.sites'):
                raise ImproperlyConfigured("FlatPageSitemap requires django.contrib.sites, which isn't installed.")
            Site = django_apps.get_model('sites.Site')
            current_site = Site.objects.get_current()
            return current_site.flatpage_set.filter(registration_required=False)