anchor.diff:      m_to_list/2,
       m_value/2,
       url_for/1,
  -    language_url_for/2
  +    language_url_for/2,
  +    label/1
   ]).
   
   -include_lib("zotonic.hrl").
  
positive.code: url_for(_) ->
      undefined.
  
  %% @doc Get URL to translated license at the Creative Commons website
  -spec language_url_for(binary(), #context{}) -> binary() | undefined.
  language_url_for(License, Context) ->
  
negative.code: m_find_value(url, #m{value = License}, _Context) ->
      url_for(License);
  m_find_value(language_url, #m{value = License}, Context) ->
      language_url_for(License, Context);
  m_find_value(label, #m{value = Uri}, _Context) ->
      label(Uri).
  
  m_to_list(_, _Context) ->
      [].
  