Re: finding a triple on the web

Thanks for all of your comments. It is wonderful to have a supportive community. It is one thing I like about w3c lists. 

I saw FedX mentioned in Querying over Federated SPARQL Endpoints -A State of the Art Survey
http://arxiv.org/pdf/1306.1723.pdf

I noticed that POWDER is a way to describe large numbers of resources in an RDF store. For the Linked Data Platform it might be used for access control (authorization?) iirc. (http://www.w3.org/wiki/WebAccessControl)  I have not seen a lot about it in search. 

My current thinking is to use Miriam Fernadez's thinking in her thesis "Semantically Enhanced Information Retrieval: an ontology based approach" for a NL interface to an ontology, document, and document annotation index. Then allow for a distributed RDF store for linked data as described in (http://www.mi.fu-berlin.de/inf/publications/techreports/tr2009/B-09-04/TR-B-09-04.pdf?1346662692). Except this has a problem with All used in SPARQL.

My goal is to build a mockup with narration for An Enterprise Information System do Peer Production with a Peer to Peer Architecture. A few notes are here (http://adistributedeconomy.blogspot.com/2014/12/monthly-update-for-december-for.html?m=1).  I will share this when complete as I feel it is a rather extensive survey of linked data and semantic web, and maybe useful for at least pedagogical purposes since seems useful to push something to the limit to see what problems arise.

I am still unsure if there are multiple bases when having a federated query. I know that the SERVICE keyword allows for pointing multiple graphs. But what are they called? Thanks.

Sent from my iPhone

> On Dec 10, 2014, at 11:22 AM, Martin Kaltenböck <m.kaltenboeck@semantic-web.at> wrote:
> 
> Hi Brent
> 
> there is a European FP7 project on agri-data called semagrow: http://semagrow.eu/ that is working with POWDER (you mentioned below) - see: http://semagrow.eu/?q=methodology
> 
> Maybe it would help to get in touch with soomeone of the core team there - I would recommend to get in touch with:
> 
> Stasinos (Demokritos Greece): https://www.iit.demokritos.gr/people/konstantopoulos-stasinos
> and/or
> Jürgen (SWC, Austria): https://www.linkedin.com/in/turnguard
> 
> As far as I know they are travelling for the project this week so better ping them next week ...
> 
> Best regards from Vienna - martin
> 
> --
> Martin Kaltenböck, CMC
> Managing Partner, CFO
> 
> Semantic Web Company (SWC)
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> 
> 2014-12-10 2:57 GMT+01:00 Brent Shambaugh <brent.shambaugh@gmail.com>:
>> Dear all,
>>  
>> I am trying to figure out how it is possible to query n possible sparql endpoints for a particular triple pattern.
>> 
>> I seem to think that a federated query provided by sparql only allows explicitly mentioned sparql endpoints.
>> 
>> http://www.w3.org/TR/sparql11-federated-query/
>> 
>> It appears that powder allows filtering based on different parts of the URI:
>> 
>> http://www.w3.org/TR/powder-grouping/
>> 
>> Would I need some sort of web index that catalogues known triples that I can then use a reference point for sparql querying?
>> 
>> Sorry about my lack of knowledge.
>> 
>> -Brent Shambaugh
>