code: def expose_content(self):
          
          placeholders = get_placeholders(self.get_template())
          exposed_content = []
          for lang in self.get_languages():
              for ctype in [p.name for p in placeholders]:
                  content = self.get_content(lang, ctype, False)
                  if content:
                      exposed_content.append(content)
          return u"\r\n".join(exposed_content)
docs: Return all the current content of this page into a `string`.
  
          This is used by the haystack framework to build the search index.