old_contents: from django.contrib.sitemaps import Sitemap
  from django.core.urlresolvers import NoReverseMatch
  from fluent_faq.models import FaqCategory, FaqQuestion
  from fluent_faq.urlresolvers import faq_reverse
  
  
  def _url_patterns_installed():
      # This module can use normal Django urls.py URLs, or mount the "FaqPage" in the page tree.
      # Check whether the URLs are installed, so the `sitemap.xml` can be generated nevertheless.
      # This issue will pop up elsewhere too, so there is no need to raise an error here.
      try:
          faq_reverse('faqcategory_detail', kwargs={'slug': 'category'}, ignore_multiple=True)
      except NoReverseMatch:
          return False
      else:
          return True
  
  
  class FaqQuestionSitemap(Sitemap):
      """
      Sitemap for FAQ questions
      """
      def items(self):
          if not _url_patterns_installed():
              return None
          return FaqQuestion.objects.published().select_related('category')
  
      def lastmod(self, question):
          """Return the last modification of the object."""
          return question.modification_date
  
      def location(self, question):
          """Return url of an question."""
          return faq_reverse('faqquestion_detail', kwargs={'cat_slug': question.category.slug, 'slug': question.slug}, ignore_multiple=True)
  
  
  
  class FaqCategorySitemap(Sitemap):
      """
      Sitemap for FAQ categories.
      """
      def items(self):
          if not _url_patterns_installed():
              return None
          return FaqCategory.objects.published()
  
      def lastmod(self, category):
          """Return the last modification of the object."""
          return category.modification_date
  
      def location(self, category):
          """Return url of an category."""
          return faq_reverse('faqcategory_detail', kwargs={'slug': category.slug}, ignore_multiple=True)
  
new_contents: from django.contrib.sitemaps import Sitemap
  from django.core.urlresolvers import NoReverseMatch
  from fluent_faq.models import FaqCategory, FaqQuestion
  from fluent_faq.urlresolvers import faq_reverse
  
  
  def _url_patterns_installed():
      # This module can use normal Django urls.py URLs, or mount the "FaqPage" in the page tree.
      # Check whether the URLs are installed, so the `sitemap.xml` can be generated nevertheless.
      # This issue will pop up elsewhere too, so there is no need to raise an error here.
      try:
          faq_reverse('faqcategory_detail', kwargs={'slug': 'category'}, ignore_multiple=True)
      except NoReverseMatch:
          return False
      else:
          return True
  
  
  class FaqQuestionSitemap(Sitemap):
      """
      Sitemap for FAQ questions
      """
      def items(self):
          if not _url_patterns_installed():
              return []
          return FaqQuestion.objects.published().select_related('category')
  
      def lastmod(self, question):
          """Return the last modification of the object."""
          return question.modification_date
  
      def location(self, question):
          """Return url of an question."""
          return faq_reverse('faqquestion_detail', kwargs={'cat_slug': question.category.slug, 'slug': question.slug}, ignore_multiple=True)
  
  
  
  class FaqCategorySitemap(Sitemap):
      """
      Sitemap for FAQ categories.
      """
      def items(self):
          if not _url_patterns_installed():
              return []
          return FaqCategory.objects.published()
  
      def lastmod(self, category):
          """Return the last modification of the object."""
          return category.modification_date
  
      def location(self, category):
          """Return url of an category."""
          return faq_reverse('faqcategory_detail', kwargs={'slug': category.slug}, ignore_multiple=True)
  
subject: Fix sitemap for real