code: def citation_director(**kwargs):
      
      qualifier = kwargs.get('qualifier', '')
      content = kwargs.get('content', '')
      if qualifier == 'publicationTitle':
          return CitationJournalTitle(content=content)
      elif qualifier == 'volume':
          return CitationVolume(content=content)
      elif qualifier == 'issue':
          return CitationIssue(content=content)
      elif qualifier == 'pageStart':
          return CitationFirstpage(content=content)
      elif qualifier == 'pageEnd':
          return CitationLastpage(content=content)
      else:
          return None
docs: Direct the citation elements based on their qualifier.