Re: [office-formula] Portable documents language

[Patrick Durusau <patrick@durusau.net>]

Andreas,

Andreas J. Guelzow wrote:
> On Thu, 2010-02-04 at 17:41 -0700, Patrick Durusau wrote:
>   
>> Greetings!
>>
>> Under Named Expressions - General, we say:
>>
>>     
>>> Portable documents *should *limit the names of their identifiers to 
>>> only ([UNICODE]) letters, underscores, and digits, not including 
>>> patterns that look like cell references or the words True or False.
>>>
>>>       
>> Eh?
>>
>> Is this meant to be a reference to XML letters, underscores and digits?
>>
>> Well for that matter, can someone speculate on what names are valid as 
>> per the following syntax:
>>
>>     
>>> PortableIdentifier ::= ( LetterXML
>>>
>>>         (LetterXML | DigitXML | '_' | CombiningCharXML)* )
>>>       - ( [A-Za-z]+[0-9]+ )
>>>       - ([Tt][Rr][Uu][Ee]) - ([Ff][Aa][Ll][Ss][Ee])
>>>
>>>       
>> I suspect that something like:
>>
>> PortableIdentifier ::= ( LetterXML (LetterXML | DigitXML | '_' | CombiningCharXML)* )
>> - ([Tt][Rr][Uu][Ee]) - ([Ff][Aa][Ll][Ss][Ee])
>>
>>
>> was intended.
>>     
>
> Surely not.
>
> Strings like "A1" should surely also be excluded.
>
>   
Well, it says that in prose, "patterns that look like cell references" 
but I am not sure there is a regex that would be generally applicable 
enough to be worth including.

Would you make it any Letter + Digit? Recalling that ASCII + a Digit are 
simply familiar to us and that other users may have other default field 
headers.

Imperfect solution but I suspect an admonishment in the text is the best 
we can do.

Willing to be surprised if you have a regex that will neatly solve this 
issue!

Hope you are having a great evening!

Patrick

-- 
Patrick Durusau
patrick@durusau.net
Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)