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Re: rq25 updates (STRBEFORE, STRAFTER, REPLACE and more)

From: Steve Harris <steve.harris@garlik.com>
Date: Wed, 2 Nov 2011 09:38:11 +0000
Cc: Lee Feigenbaum <lee@thefigtrees.net>, SPARQL Working Group <public-rdf-dawg@w3.org>
Message-Id: <E5BB354D-48A6-4941-ADC5-A8C69A3721A2@garlik.com>
To: Andy Seaborne <andy.seaborne@epimorphics.com>
I'm quite convinced by Lee's argument around consistency, so prefer Option 2.

- Steve
 
On 2 Nov 2011, at 09:35, Andy Seaborne wrote:

> I've implemented option 2 for now.  If there is further support for option 3, we can do that as well as the document if in a better state for making changes.
> 
> In doing the changes, and for general editting, I have cleaned up all the function prototypes, invented the term "string literal" to cover simple literal, plain literal with language string and xsd:string. "string literal" is used in quite a few places where we already had this situation (e.g. UCASE).
> 
> There is text discussing the return type as being the same kind as the main argument acted up (which happens to be the first one).
> 
> A lot of fixing up the XML because the original conversion from XHTML had broken the formatting.
> 
> Please - could someone check 17.4 - I'm now at the point where I see what should be there, not what is there.
> 
> I changed ARQ for the more liberal argument input and didn't get any test fails from the suite.
> 
> 	Andy
> 
> On 01/11/11 13:25, Lee Feigenbaum wrote:
>> On 10/31/2011 10:26 AM, Steve Harris wrote:
>>> On 2011-10-31, at 13:41, Andy Seaborne wrote:
>>> 
>>>> I've put in text for STRBEFORE, STRAFTER and REPLACE, removed SHA224,
>>>> and done some tidying up in the area.
>>>> 
>>>> See
>>>> http://www.w3.org/2009/sparql/docs/query-1.1/rq25.xml#func-strings
>>>> and onwards.
>>>> 
>>>> 
>>>> 
>>>> One issue arises:
>>>> 
>>>> REGEX currently takes a simple literal only for the first argument.
>>>> 
>>>> For RDF 1.1 preparation, this should change to xsd:string or simple
>>>> literal.
>>>> 
>>>> 
>>>> REPLACE is like REGEX except it makes replacements.
>>>> 
>>>> What should the first argument to REPLACE be?
>>>> 
>>>> I'm assuming the pattern replacement and flags are still simple
>>>> literals (or + xsd:strings for RDF 1.1).
>>>> 
>>>> Like REGEX only working on plain strings.
>>>> Or also process language tagged literals?
>>>> (c.f. STRBEFORE and STRAFTER)
>>>> 
>>>> I'd like REGEX and REPLACE to align.
>>>> 
>>>> Proposal 1:
>>>> REGEX and REPLACE work on strings (simple literal or xsd:string) only.
>>>> 
>>>> Proposal 2:
>>>> REGEX and REPLACE work on all string-like forms as first argument
>>>> (includes literals with language tag). This adds first argument
>>>> literal with language tag to REGEX.
>>> 
>>> I prefer 2.
>>> 
>>> There's even an option:
>>> 
>>> Proposal 3:
>>> REGEX and REPLACE work on all literal forms as first argument
>>> (includes literals with language tags and typed literals). This adds
>>> first argument literal with language tag or datatype to REGEX.
>>> 
>>> Not sure if I prefer that to 2, but it is an option.
>> 
>> I prefer option 2 or option 1. I understand the motivation for option 3,
>> but in general we've shied away from that sort of automatic casting in
>> SPARQL, and I believe we ought to continue that way.
>> 
>> Lee
>> 
>>> 
>>> - Steve
>>> 
> 
Received on Wednesday, 2 November 2011 09:38:49 GMT

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