Design Questions

[Daniel Leuck]

> 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.

Nope.  Its unambiguous in SDL.  "null" works the same way as Java or C# -it
uses a null literal.

empty_string ""
null_value null

See:
http://sdl.ikayzo.org/docs/display/SDL/Language+Guide#LanguageGuide-literals

 
> 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.

Excellent point. Perhaps a "struct" keyword is in order.

Dan