Re: [Iptel] [Editorial Errata Reported] RFC3966 (4376)

[OKUMURA Shinji <[e-mail]>]

Hi Paul,

>On 5/27/15 7:30 AM, OKUMURA Shinji wrote:
>> Hi,
>>
>> phonedigit is used in an extension rule.
>>
>>     extension            = ";ext=" 1*phonedigit
>>
>> if the original definition is correct, I think a following
>> description is valid.
>>
>> tel:1234;ext=;phone-context=example.com
>>
>> May an extension number be an empty string?
>
>That would be bad.
>
>But your errata fix isn't sufficient for extension because it would 
>allow an extension including only visual-separators. ISTM that to 
>complete the fix the rule for extension also needs to be changed to:
>
>   extension            = ";ext=" *phonedigit DIGIT *phonedigit

I see, and IIUC this is reducible as below.

   extension            = ";ext=" *visual-separator DIGIT *phonedigit

The two are equivalent, but from a parser implementor's perspective
the latter is better (I think).

Regards,
Shinji

>> At the very start what is the reason why visual-separator became an
>> optional rule?
>
>I don't know. It certainly seems to have been a mistake.
>
>> according to the document history,
>>
>> RFC2806
>>     phonedigit            = DIGIT / visual-separator
>>
>> draft-ietf-iptel-rfc2806bis-01
>>     phonedigit            =  DIGIT [ visual-separator ]
>>     phonedigit-hex        =  HEXDIG [ visual-separator ]
>>
>> draft-ietf-iptel-rfc2806bis-02
>>     phonedigit            =  DIGIT / [ visual-separator ]
>>     phonedigit-hex        =  HEXDIG / "*" / "#" / [ visual-separator ]
>
>	Thanks,
>	Paul
>
>> Anydody know the intent of this fix?
>>
>> Regards,
>> Shinji
>>
>>> This errata should be rejected.
>>>
>>> - Jason
>>>
>>>
>>>
>>> On 5/26/15, 11:47 AM, "RFC Errata System" <[e-mail]>
>>> wrote:
>>>
>>>> The following errata report has been submitted for RFC3966,
>>>> "The tel URI for Telephone Numbers".
>>>>
>>>> --------------------------------------
>>>> You may review the report below and at:
>>>> http://www.rfc-editor.org/errata_search.php?rfc=3966&eid=4376
>>>>
>>>> --------------------------------------
>>>> Type: Editorial
>>>> Reported by: OKUMURA Shinji <[e-mail]>
>>>>
>>>> Section: 3
>>>>
>>>> Original Text
>>>> -------------
>>>> phonedigit           = DIGIT / [ visual-separator ]
>>>> phonedigit-hex       = HEXDIG / "*" / "#" / [ visual-separator ]
>>>>
>>>>
>>>> Corrected Text
>>>> --------------
>>>> phonedigit           = DIGIT / visual-separator;
>>>> phonedigit-hex       = HEXDIG / "*" / "#" / visual-separator;
>>>>
>>>>
>>>> Notes
>>>> -----
>>>> An optional and alternative rule is typically meaningless.
>>>>
>>>> Instructions:
>>>> -------------
>>>> This erratum is currently posted as "Reported". If necessary, please
>>>> use "Reply All" to discuss whether it should be verified or
>>>> rejected. When a decision is reached, the verifying party (IESG)
>>>> can log in to change the status and edit the report, if necessary.
>>>>
>>>> --------------------------------------
>>>> RFC3966 (draft-ietf-iptel-rfc2806bis-09)
>>>> --------------------------------------
>>>> Title               : The tel URI for Telephone Numbers
>>>> Publication Date    : December 2004
>>>> Author(s)           : H. Schulzrinne
>>>> Category            : PROPOSED STANDARD
>>>> Source              : IP Telephony
>>>> Area                : Real-time Applications and Infrastructure
>>>> Stream              : IETF
>>>> Verifying Party     : IESG