class GoodSeries(models.Model):
    brand = models.ForeignKey(GoodBrand)
    series_name = models.CharField(max_length=250, verbose_name=u"Название")
    description = models.TextField(verbose_name=u"Описание", blank=True)
    def get_absolute_url(self):
        return reverse('group_goods', args=[self.series_name])

class SeriesMap(Sitemap):
    changefreq = 'weekly'
    priority = '0.8'
    
    def items(self):
        return GoodSeries.objects.all()

sitemaps = {
            'series':SeriesMap,
            }
urlpatterns = patterns('',
    url(r'^all/$', views.all_series), 
    url(r'^(?P<series>[\w\s\"\,\.\-]+)/$', views.group_goods),
    url(r'^company/(?P<company>[\w\s\"\,\.\-]+)/$', views.see_company),
    url(r'^(?P<series>[\w\s\"\,\.\-]+)/page_(?P<page_num>\d+)/$', views.group_goods),
   
)

И в глобальном urls.py
(r'^sitemap.xml$', 'django.contrib.sitemaps.views.sitemap', {'sitemaps': sitemaps}),