Opening a can of worms

[Philip Taylor (RHBNC)]

> The two items in question are:

>     {\abbr{ISO}-9660} imposes the following limitations:

>     \item File and directory names, not including any directory path or
>     extension part, may not exceed eight characters.

>     \item Filenames may have a single extension.  Extensions may not exceed
>     three characters. Directory names may not have an extension.

> In this case, I find `may not' preferable to `must not' or `shall not'
> for some reason. I know it's ambiguous, though. I'll change it if others
> prefer, I don't feel that strongly.

I would support the use of `may not', since it carries with it the
added value `in a conformant implementation' implicitly.  ** Phil.