[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

XML Schema Part 2 should provide BNF for all primitive types.

• From: Kohsuke KAWAGUCHI <k-kawa@b...>
• To: Steve.Rosenberry@E...
• Date: Mon, 26 Mar 2001 12:18:30 -0800

> but none of these documents actually has the RE that defines a string as
> a valid float value that I was hoping to copy (at least not that I could
> find).

You couldn't find them because there is none. And I think the spec
should provide more precise definition of what are valid lexical
representation of primitive types. BNF is certainly a good way to do
this.

Good news is, XML Schema is still a PR. That means there is still a
chance to have them add BNF. So please post your comment to
www-xml-schema-comments@w... about adding
BNF to the spec. I've already posted one, but the same comment from a
different person should counts.


Currently, the spec describes lexical representation without using any
formal language. For example, you can find the following statement in
the description of "number" type.

> An optional leading sign is allowed. If the sign is omitted, "+" is
> assumed. Leading and trailing zeroes are optional. 

OK. I think "0.0" is a valid "number". Since leading zeroes are optional,
it seems to me that the current spec allows ".0" as a valid "number".

There is more, by removing optional trailing zeroes, "." becomes a valid
"number". Really?  But why not?

These are happening everywhere in the spec, and much worse in date/time
related types.


So please let WG knows your thought.

regards,
----------------------
K.Kawaguchi
E-Mail: k-kawa@b...

• Follow-Ups:
  • Re: Combining float/string to specify value/units
    • From: Steve Rosenberry <steve.rosenberry@v...>

• References:
  • Re: Combining float/string to specify value/units
    • From: "Thomas B. Passin" <tpassin@h...>
  • Re: Combining float/string to specify value/units
    • From: Steve Rosenberry <steve.rosenberry@v...>

• Prev by Date: Examplotron 0.3 [1]
• Next by Date: Re: Web Philosophy
• Previous by thread: Re: Combining float/string to specify value/units
• Next by thread: Re: Combining float/string to specify value/units
• Index(es):
  • Date
  • Thread