Re: Linked Data Fragments: Web-scale querying

On 3/19/14 10:03 AM, Olaf Hartig wrote:
> Hi Martynas,
>
> On Wednesday 19 March 2014 12:58:15 Martynas Jusevičius wrote:
>> >Ruben,
>> >
>> >interesting stuff. I remember another project that does something like that:
>> >SQUINhttp://squin.sourceforge.net/index.shtml
> SQUIN implements a traversal-based query execution strategy that relies only
> on the Linked Data publishing principles (i.e., the possibility to look up
> HTTP URIs). Query processing approaches that have this property are typically
> referred to as Linked Data query processing. If you want to get an overview on
> these approaches, you may want to check out my recent survey [1].
>
>   
>> >How does LDF compare to to it?
> I understand LDF more as an alternative practice for publishing (Linked) data
> on the Web. However, the primary purpose for proposing this practice (as Ruben
> and his colleagues emphasize in their LDOW paper) his to facilitate
> distributed querying without putting most of the burden on the servers.
>
> So, the primary difference between querying LDFs and the aforementioned Linked
> Data query processing is that querying LDFs is a form of distributed query
> processing, that is, some part of the execution of a given user query is
> distributed to LDF servers (which provide a limited form of query processing
> functionality). In contrast, Linked Data query processing  is_not_  a form of
> distributed query processing. Instead, for Linked Data query processing
> approaches, the whole execution of a query happens within the Linked Data
> query processing system (e.g., SQUIN), simply because these approaches do not
> assume / rely on server-side query processing functionality (servers in this
> setting are only required to answer URI lookup requests).
>
> Cheers,
> Olaf
>
>
> [1] Olaf Hartig: An Overview on Execution Strategies for Linked Data Queries.
> In Datenbankspektrum, 13(2) Jul. 2013.
> http://olafhartig.de/files/Hartig_LDQueryExec_DBSpektrum2013_Preprint.pdf
>
>
>   

Olaf,

Is there a live showcase instance of SQUIN somewhere?

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