Portable documents language

[Patrick Durusau <patrick@durusau.net>]

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.

Please confirm and I can fix for the next version.

Hope everyone is having a great day!

Patrick

PS: Is there some reason we don't simply cite the XML 1.0 standard and 
use the names, Letter, Digit, CombiningChar found there?



-- 
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)