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Re: ISSUE-18: How do we parse "18." in Turtle?

From: David Wood <david.wood@talis.com>
Date: Fri, 1 Apr 2011 12:00:18 -0400
Cc: Steve Harris <steve.harris@garlik.com>, Sandro Hawke <sandro@w3.org>, Pat Hayes <phayes@ihmc.us>, public-rdf-wg@w3.org
Message-Id: <B924EFF8-CFCC-47B9-9BA6-4893C4F2BDE8@talis.com>
To: Andy Seaborne <andy.seaborne@epimorphics.com>
On Apr 1, 2011, at 04:13, Andy Seaborne wrote:
> On 01/04/11 02:20, Steve Harris wrote:
>> On 2011-03-31, at 22:27, Sandro Hawke wrote:
>> 
>>> On Wed, 2011-03-30 at 15:11 -0500, Pat Hayes wrote:
>>>> 
>>>> +1  I feel Sandro's pain, but the advantages of fast greedy lexers has
>>>> to outweigh visual aesthetics. And in any case, I kind of like the
>>>> spaces, they help my mental lexer when reading.
>>> 
>>> To be clear, I'm fine with greedy lexers, I just want to require at
>>> least one digit after the decimal point for it to be considered a
>>> decimal point, instead of a statement-ending period.   I believe it's a
>>> trivial change to the grammar and no other change to code.
>> 
>> XSD says that leading and trailing zeros can be omitted, I suspect that's the source of it. I'm not a fan of 18. either though. The canonical form requires a digit either side of the ".".
>> 
>> http://www.w3.org/TR/xmlschema-2/#decimal-lexical-representation
> 
> Yes - that might be the source.
> 
> The Turtle grammar (submission, the WG working doc) allows leading . as well:
> 
> 1.  .1  .1e0 (an xsd:double)  1.e0
> 
> The canonical representation in XSD 1.1 has changed: the decimal of integer valued decimals is prohibited -- so integer and decimal canonical forms are the same. It's the decimal point in Turtle that triggers the short form.


Compatibility between W3C specs should take precedence over preference considerations.

Regards,
Dave
-- chair hat ON


> 
> http://www.w3.org/TR/xmlschema11-2/#decimal
> 
> 	Andy
> 
Received on Friday, 1 April 2011 16:00:53 GMT

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