old_contents: from django import template
  
  # backwards compatibility import
  from feincms.templatetags.fragment_tags import fragment, get_fragment, has_fragment
  
  register = template.Library()
  
  register.tag(fragment)
  register.tag(get_fragment)
  register.filter(has_fragment)
  
  
  @register.simple_tag
  def feincms_render_region_appcontent(page, region, request):
      """Render only the application content for the region
  
      This allows template authors to choose whether their page behaves
      differently when displaying embedded application subpages by doing
      something like this::
  
          {% if not in_appcontent_subpage %}
              {% feincms_render_region feincms_page "main" request %}
          {% else %}
              {% feincms_render_region_appcontent feincms_page "main" request %}
          {% endif %}
      """
      from feincms.content.application.models import ApplicationContent
      from feincms.templatetags.feincms_tags import _render_content
  
      return u''.join(_render_content(content, request=request) for content in\
          getattr(page.content, region) if isinstance(content, ApplicationContent))
  
new_contents: from django import template
  
  # backwards compatibility import
  from feincms.templatetags.fragment_tags import fragment, get_fragment, has_fragment
  
  register = template.Library()
  
  register.tag(fragment)
  register.tag(get_fragment)
  register.filter(has_fragment)
  
  
  @register.simple_tag
  def feincms_render_region_appcontent(page, region, request):
      """Render only the application content for the region
  
      This allows template authors to choose whether their page behaves
      differently when displaying embedded application subpages by doing
      something like this::
  
          {% if not in_appcontent_subpage %}
              {% feincms_render_region feincms_page "main" request %}
          {% else %}
              {% feincms_render_region_appcontent feincms_page "main" request %}
          {% endif %}
      """
      from feincms.content.application.models import ApplicationContent
      from feincms.templatetags.feincms_tags import _render_content
  
      return u''.join(_render_content(content, request=request) for content in\
          page.content.all_of_type(ApplicationContent) if content.region == region)
  
subject: Use all_of_type instead of isinstance check in feincms_render_region_appcontent