def METHOD_NAME(self, classification, lang, node=None):
    """Provide data for the context and the uptodate list for the list of the given classifiation."""
    descriptions = self.site.config['AUTHOR_PAGES_DESCRIPTIONS']
    kw = {
        "messages": self.site.MESSAGES,
    }
    context = {
        "author": classification,
        "title": kw["messages"][lang]["Posts by %s"] % classification,
        "description": descriptions[lang][classification] if lang in descriptions and classification in descriptions[lang] else None,
        "pagekind": ["index" if self.show_list_as_index else "list", "author_page"],
    }
    kw.update(context)
    return context, kw