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Re: problem with a SPARQL QUERY

From: Story Henry <henry.story@bblfish.net>
Date: Mon, 26 Apr 2010 18:09:01 +0100
Cc: public-cwm-talk@w3.org
Message-Id: <685272E9-63FD-4A1D-88AA-4E338719484E@bblfish.net>
To: Sergio Fernández <sergio.fernandez@fundacionctic.org>
Yes, I can 

$ curl -I http://www.w3.org/2000/10/swap/grammar/sparql
HTTP/1.1 200 OK
Date: Mon, 26 Apr 2010 17:06:14 GMT
Server: Apache/2
Content-Location: sparql.n3
Vary: negotiate
TCN: choice
Last-Modified: Thu, 04 Aug 2005 16:35:09 GMT
ETag: "82e5-3fd852a1aa940;475d1b91ad240"
Accept-Ranges: bytes
Content-Length: 33509
Cache-Control: max-age=21600
Expires: Mon, 26 Apr 2010 23:06:14 GMT
P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml"
Connection: close
Content-Type: text/n3; qs=0.89

On the other hand

$ curl -I -H "Accept: x-application/sparql" http://www.w3.org/2000/10/swap/grammar/sparql
HTTP/1.1 406 Not Acceptable
Date: Mon, 26 Apr 2010 17:07:21 GMT
Server: Apache/2
Alternates: {"sparql.n3" 0.89 {type text/n3} {length 33509}}
Vary: negotiate
TCN: list
Connection: close
Content-Type: text/html; charset=iso-8859-1


But then it should not be making that connection anyway, as I have that file available locally in the cwm 
repository. Doing this request for the remote document, will just slow down sparql queries. Looks like there
is a canonical URL in the code where it should be relative.

Henry



On 26 Apr 2010, at 17:57, Sergio Fernández wrote:

> Looking to the python's tracebak, actually it's not a problem on your
> query, but a problem accessing the grammar file at [1]. Try to make a
> request with other console tool, such as curl, just in order to be sure
> that you can access to that N3 document.
> 
> Best,
> 
> [1] http://www.w3.org/2000/10/swap/grammar/sparql
> 
> On Mon, 2010-04-26 at 17:32 +0100, Story Henry wrote:
>> I think I have  a pretty simple SPARQL query here, and it looks fine. But running it on the head of
>> swap seems to cause trouble.
>> 
>> $ cat p1.sparql 
>> SELECT ?r
>> WHERE {
>>   ?s ?r ?pk .
>> }
>> 
>> 
>> $ cwm --mode=rse proof1.n3 ont.n3  --think --sparql=p1.sparql 
>> #Processed by Id: cwm.py,v 1.197 2007/12/13 15:38:39 syosi Exp 
>>        #    using base file:///Users/hjs/Programming/FoafSSL/foafssl-java/papers/spot2009/n3/
>>        Traceback (most recent call last):
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/cwm.py", line 750, in <module>
>>    doCommand()
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/cwm.py", line 564, in doCommand
>>    referer="", contentType="x-application/sparql")
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/llyn.py", line 1616, in load
>>    referer=referer, why=why)  
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/webAccess.py", line 195, in load
>>    p = sparql_parser.N3Parser(StringIO.StringIO(buffer), sparql_parser.branches, convertor)
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/sparql/sparql_parser.py", line 47, in __init__
>>    lexer = sparql_tokens.Lexer()
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/sparql/sparql_tokens.py", line 272, in __init__
>>    self.fixTokens()
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/sparql/sparql_tokens.py", line 314, in fixTokens
>>    importTokens()
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/sparql/sparql_tokens.py", line 40, in importTokens
>>    F = myStore.load('http://www.w3.org/2000/10/swap/grammar/sparql')
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/myStore.py", line 166, in load
>>    remember=remember, flags=flags)
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/llyn.py", line 1616, in load
>>    referer=referer, why=why)  
>>  File "/Users/hjs/Programming/w3.org/2000/10/swap/webAccess.py", line 178, in load
>>    raise DocumentAccessError(addr, sys.exc_info() )
>> swap.webAccess.DocumentAccessError: Unable to access document <http://www.w3.org/2000/10/swap/grammar/sparql>, because:
>>    HTTP Error 406: Not Acceptable
>> 
>> 
>> It seems like it is trying to make a local request, and having problems with the mime type...
>> 
>> Henry
>> 
>> Social Web Architect
>> http://bblfish.net/
>> 
>> 
> 
> -- 
> Sergio Fernández
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Received on Monday, 26 April 2010 17:09:32 GMT

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