- From: Manu Sporny <msporny@digitalbazaar.com>
- Date: Sun, 12 May 2013 21:45:16 -0400
- To: W3C RDF WG <public-rdf-wg@w3.org>
On 05/10/2013 06:31 PM, Sandro Hawke wrote: > I believe, by saying in situations where there might be a loss, one > MUST NOT convert to a number. We didn't do this because the range for a JSON number isn't defined anywhere. > It's true we don't know exactly when there might be a loss, but after > talking with Markus, I'm pretty confident that using the range of > 32-bit integers will work well. ... except that most systems support 64-bit numbers, and we'd be hobbling those systems. :/ We might want to put in guidance that moves the decision to the processor (it can detect when a conversion would result in data loss). Perhaps it should be up to the implementation to determine when data could be lost. > I'd also add: > > "1"^^xs:int // not native since it's 'int' not > 'integer' "01"^^xs:integer // not native since it's not in > canonical form +1 > These rules will make xs:integer data round tripping through JSON-LD > perfectly lossless, I believe, on systems that can handle at least > 32 bit integers. Yeah, but I'm still concerned about the downsides of limiting the number to 32-bits, especially since most of the world will be using 64-bit machines from now on. I do agree that we might be able to change the text to ensure that precision loss isn't an issue, and I do agree with you that it's definitely worth trying to prevent data loss. Tracking the issue here: http://lists.w3.org/Archives/Public/public-rdf-wg/2013May/0136.html > On a related topic, there's still the problem of xs:double. I don't > have a good solution there. I think the only way to prevent > datatype corruption there is to say don't use native number when the > value happens to be an integer. I don't quite understand, can you elaborate a bit more? Do you mean, this would be an issue? "234.0"^^xsd:double --- fromRDF() ---> JsonNumber(234) -- manu -- Manu Sporny (skype: msporny, twitter: manusporny, G+: +Manu Sporny) Founder/CEO - Digital Bazaar, Inc. blog: Meritora - Web payments commercial launch http://blog.meritora.com/launch/
Received on Monday, 13 May 2013 01:45:53 UTC