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- From: Paul Janssens <paul.janssens@skynet.be>
- To: xml-dev@ic.ac.uk
- Date: Fri, 26 Mar 1999 19:14:51 +0100
Frank Boumphrey wrote:
>
> In SGML you can put
> (a&b&c) whicch means that eachelement must appear only once but in any
> order.
...
>
> My understanding was that it was ommited because of the requirement
>
> "XML software shall be easy to write"
>
> It takes only a few lines of C code to validate the second requirement but a
> LOT more to validate the first.
>
How about expanding it as you parse the DTD (bottom-up coding)
node ampersand(node a node b) {
return or(concat(a,b),concat(clone(b),clone(a)));
}
that's just adding three lines to your code.
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