anchor.diff:  		undefined_functions,
   		locals_not_used,
   
  -		%% this lists lots of functions - some are exported 
  +		%% this lists lots of functions - some are exported
   		%% behaviour callbacks, others are unused functions intended
   		%% for future use (to expose a useful interface to the module)
   		%% and some are probably callback functions not related to
   		%% behaviours.
   
  -		%% exports_not_used, 
  -		deprecated_function_calls, 
  -		deprecated_functions 
  -		
  -		%% {deprecated_function_calls, DeprFlag}, 
  -		%% {deprecated_functions, DeprFlag}, 
  -		%% {call, FuncSpec}, 
  -		%% {use, FuncSpec}, 
  -		%% {module_call, ModSpec}, 
  -		%% {module_use, ModSpec}, 
  -		%% {application_call, AppSpec}, 
  -		%% {application_use, AppSpec}, 
  -		%% {release_call, RelSpec}, 
  -		%% {release_use, RelSpec} 
  +		%% exports_not_used,
  +		deprecated_function_calls,
  +		deprecated_functions
  +
  +		%% {deprecated_function_calls, DeprFlag},
  +		%% {deprecated_functions, DeprFlag},
  +		%% {call, FuncSpec},
  +		%% {use, FuncSpec},
  +		%% {module_call, ModSpec},
  +		%% {module_use, ModSpec},
  +		%% {application_call, AppSpec},
  +		%% {application_use, AppSpec},
  +		%% {release_call, RelSpec},
  +		%% {release_use, RelSpec}
   	       ],
   
       %% format analysis results
  
positive.code: %% Code for testing during development. Finds misspelled function 
  %% names and incorrect arity usage. It requiers that the modules 
  %% tested, have already been debug compiled - use erlc with the 
  %% +debug_info flag, e.g. :
  %% 
  %% erlc +debug_info xxxx.erl
  %%
  %% This code assumes that the current directory (when calling 
  %% xref_test:run) is the build folder (the directory where the .beam 
  %% files are). 
  %% This code has been tested on my (hsten) local machine, with a
  %%
  %% > cd src
  
negative.code: 
  
      AddOptions = [
  		  {builtins, false},
  		  {recurse, false},
  		  {verbose, true},
  		  {warnings, true}
  		 ],
  
      %% tell xref where to look for modules to check
      Res = xref:add_directory(Xref, ".", [{recurse, true}]),
      io:format("add_directory: ~n~p~n", [Res]),
  
  
  
      %% determine which properties to check with xref
  