anchor.diff:  	Desc = {description, "Home Service Provider specified service class and provided if supported by Access Provider for that session"},
   	Conf = {configurable, true},
   	Typ1 = {valueType, "string"},
  -	Def1 = {default, false},
  -	Value1 = {struct, [Typ1, Def1]},
  +	Value1 = {struct, [Typ1]},
   	Value = {usageSpecCharacteristicValue, {array, [Value1]}},
   	NewAcc = [{struct, [Name, Desc, Conf, Value]} | Acc],
   	spec_public_wlan31(NewAcc).
  
positive.code: 	Desc = {description, "MAC Address of the end user's device as formatted in RFC3580, section 3.21. For example, 00-10-A4-23-19-C0"},
  	Conf = {configurable, true},
  	Typ1 = {valueType, "string"},
  	Def1 = {default, false},
  	Value1 = {struct, [Typ1, Def1]},
  	Value = {usageSpecCharacteristicValue, {array, [Value1]}},
  	NewAcc = [{struct, [Name, Desc, Conf, Value]} | Acc],
  	spec_public_wlan9(NewAcc).
  
negative.code: 	Desc = {description, "Filter-Id attribute"},
  	Conf = {configurable, true},
  	Typ1 = {valueType, "string"},
  	Value1 = {struct, [Typ1]},
  	Value = {usageSpecCharacteristicValue, {array, [Value1]}},
  	{struct, [Name, Desc, Conf, Value]}.
  
  