Re: [relax-ng] Re: RELAX NG 2.0 ideas

[David RR Webber - XMLGlobal <Gnosis_@compuserve.com>]

Message text written by John Cowan
>
And contrariwise: if you cannot specify hardwired constraints, you
may break rigid downstream systems that *know* that there are 28, 30,
or 31 days in a Gregorian month:

        element month {
                repeat 28 { day } | repeat 30 31 { day }
                }
<<<<

John,

I'm not saying exclude #'s - just the default should encourage people
to build software that works regardless.  Notice the +, * and limit=n 
mechanism allows you cover off all value combos that min=, max= 
does - BUT - forces them to think open - so I'd design something :

 year [ month(month_number, month_days) ] 

 as a memory structure I can just assert facts into, rather than hardwiring
 limits into a static array (did I mention arrays are another of my pet
peeves?).

BTW the month is a good example since Hegira calendars 
have 29 or 30 day months depending on the phase of the moon.... ; -)

Cheers, DW.