W3C home > Mailing lists > Public > public-rdf-dawg@w3.org > October to December 2009

Re: Example updates

From: Steve Harris <steve.harris@garlik.com>
Date: Fri, 4 Dec 2009 10:49:09 +0000
Cc: SPARQL Working Group <public-rdf-dawg@w3.org>
Message-Id: <2F63B0D4-ACF0-489E-AE75-0C33539F1970@garlik.com>
To: Paul Gearon <gearon@ieee.org>
On 3 Dec 2009, at 16:38, Paul Gearon wrote:
> On Thu, Dec 3, 2009 at 5:57 AM, Steve Harris  
> <steve.harris@garlik.com> wrote:
>> On 3 Dec 2009, at 01:44, Paul Gearon wrote:
>>
>>> On Wed, Dec 2, 2009 at 6:32 AM, Steve Harris <steve.harris@garlik.com 
>>> >
>>> wrote:
>>>>
>>>> On 1 Dec 2009, at 21:06, Paul Gearon wrote:
> <snip/>
>>>>> (2)
>>>>> WITH <people_graph>
>>>>> INSERT INTO <email_graph> {?person foaf:mbox ?email };
>>>>> INSERT INTO <name_graph> {?person foaf:name ?name }
>>>>> WHERE {
>>>>>  ?person a foaf:Person
>>>>>  OPTIONAL { ?person foaf:mbox ?email }
>>>>>  OPTIONAL { ?person foaf:name ?name }
>>>>> }
>>>>
>>>> Surely variable bindings don't span the ; ?
>>>
>>> I expected them to come out of the WHERE, so yes, they do. The only
>>> binding that occurs in the above example is in the WHERE clause. The
>>> INSERTs are just using an already bound set of variables.
>>
>> To me that seems very strange.
>
> I see where you are coming from, but recall that the ; characters are
> just there to separate the various INSERTs and DELETEs. They are all
> supposed to be part of the same command, and that command has a single
> WHERE clause.
>
> From what I can see, the need for these separator characters is really
> to protect having multiple directives, and wouldn't be needed if your
> proposed option of using GRAPH inside a single INSERT and single
> DELETE were adopted. (The point I failed to realize on my first time
> through this). I'm still uncomfortable with "quadifying" the syntax in
> this way, but it's starting to make more sense to me, particularly if
> we can use WITH to reduce the use of the word GRAPH everywhere.

I don't see it "quadifying" (good word) the syntax any more than the  
WHERE, or FROM it's still explicitly triples, inside a GRAPH {} block.

- Steve

-- 
Steve Harris, CTO, Garlik Limited
2 Sheen Road, Richmond, TW9 1AE, UK
+44(0)20 8973 2465  http://www.garlik.com/
Registered in England and Wales 535 7233 VAT # 849 0517 11
Registered office: Thames House, Portsmouth Road, Esher, Surrey, KT10  
9AD
Received on Friday, 4 December 2009 10:49:40 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 16:15:40 GMT