anchor.diff:  %%           ContactParam
   %% Returns : [string()] | []
   %%--------------------------------------------------------------------
  -find(ContactParam, Key) ->
  +find(ContactParam, Key) when is_record(ContactParam, contact_param), is_list(Key) ->
       Data = ContactParam#contact_param.pairs,
       CKey = httpd_util:to_lower(Key),
       key_val_db:find(Data, CKey).
  
positive.code: %%           component is already present in Params
  %%--------------------------------------------------------------------
  to_norm(Params) when is_list(Params) ->
      F = fun({Name, ValIn}) ->
  		Val =
  		    case ValIn of
  			none ->
  
negative.code: -export([
  	 %% create contact_param
  	 to_norm/1,
  	 %% form contact_param to other format
  	 to_list/1,
  	 to_string/1,
  	 %% modify
  