Adam Beneschan expounded in news:2318cabb-080c-42a0-8219-21c347abe172
@o11g2000yqj.googlegroups.com:

>> �type LNumber_Type is range 0..99_999;
>>
>> Can I declare..
>>
>> �for LNumber_Type'Image use LNumber_To_String;
> 
> No.
> 
> Broadly, you can't use a FOR attribute specification on every
> attribute, just a few select ones that the language specifically says
> you can.  'Image isn't one of those.
> 
> I think it's been mentioned a few times on this newsgroup that it
> might be nice to have this ability, but I don't see that anyone has
> submitted an actual language change proposal.
> 
>                                 -- Adam

There's probably bigger fish to fry, I suppose. 

I'm just being a typical lazy programmer (not always 
wanting to lookup the correct package prefix for
the To_String() function to use).

Warren