Design Questions

[J. David Beutel]

Daniel Leuck wrote:

> (!=null)
>

This might be RTFM, but what does a null string look like in an SDL 
file? Hopefully no Oracle-ish confusion with empty strings.

>
> For SDLS
>
> Example:
>
> things required {
>
> values double (>=2,<5) int (>0) string (~=”java.*”, !=null) char... 
> (!=null)
>
> attribute required “name” string (!=null)
>
> attribute required “size” int (>0, <=100)
>
> attribute optional “weight” int (>=0)
>
> attribute optional “favorite_char” char (‘a’ | ‘b’ | ‘c’)
>
> }
> Defines a required tag “things”...
>

This looks good for simple cases, but defining types would be useful for 
complex schemas. Suppose you have two tags, "favorite" and "worst", both 
of which follow the "things" constraints. Using only literal types would 
get redundant.

Cheers,
11011011