Re: [xml-dev] #Announce published JXML schema, an XML schema forreprese

[Michael Kay <mike@saxonica.com>]

> xs:boolean is a rather irritating type, a relic of the SGML days when
> the cost of a document was measured in keystrokes, making "true" four
> times more expensive than "1" and "false" five times more than "0".
> I suppose an appropriate restriction of xs:boolean (is that even
> possible?)  would be better.
>

Yes, it's possible - you can restrict the lexical space of a simple type 
without restricting its value space by using the pattern facet. But in 
this case, one would have to ask "to what purpose". It's essentially 
just imposing one's personal taste, rather like restricting numbers to 
disallow a leading "+" sign. You can tell when someone is committed to 
standards by the fact that they conform even when it goes against their 
personal taste.

Michael Kay
Saxonica