- From: Olaf Hartig <ohartig@uwaterloo.ca>
- Date: Fri, 21 Mar 2014 10:03:19 -0400
- To: <public-lod@w3.org>
On Wednesday 19 March 2014 11:09:20 Kingsley Idehen wrote: > 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? I'm not maintaining any at the moment. Olaf
Received on Friday, 21 March 2014 14:04:15 UTC