- From: Prateek <jainprateek@gmail.com>
- Date: Wed, 19 Mar 2014 11:05:49 -0400
- To: Muhammad Saleem <saleem.muhammd@gmail.com>
- Cc: Olaf Hartig <ohartig@uwaterloo.ca>, public-lod@w3.org, "semantic-web@w3.org Web" <semantic-web@w3.org>, Martynas Jusevičius <martynas@graphity.org>
- Message-ID: <CAL4_49AQCKaGbjJP=xgP9dmwz-CpR_sPhiZQDwq5QPfa7x6XOQ@mail.gmail.com>
Hi Martynas, Similarly our work "Alignment-Based Querying of Linked Open Data" [1] might be of interest to you as well. The system does federated querying of LOD datasets using alignments from ontology matching tool BLOOMS [2]. [1] http://knoesis.wright.edu/pascal/pub/aloqus_2012.pdf [2] http://rd.springer.com/chapter/10.1007/978-3-642-17746-0_26#page-1 Best Prateek Jain, Ph. D. RSM IBM T.J. Watson Research Center Yorktown Heights, NY 10598 On Wed, Mar 19, 2014 at 10:55 AM, Muhammad Saleem <saleem.muhammd@gmail.com>wrote: > Hi all, > > An interesting discussion!!!. A good overview and a fine-grained > experimental evaluation of SPARQL query federation approaches presented in > [1] might be of interest. > > [1] http://www.semantic-web-journal.net/system/files/swj625.pdf. > > > Best, > Muhammad Saleem > PhD student AKSW, University of Leipzig, Germany > URL: https://sites.google.com/site/saleemsweb/ > Skype: saleem.muhammd > > > On Wed, Mar 19, 2014 at 3:03 PM, Olaf Hartig <ohartig@uwaterloo.ca> wrote: > >> Hi Martynas, >> >> On Wednesday 19 March 2014 12:58:15 Martynas JuseviÄius wrote: >> > Ruben, >> > >> > interesting stuff. I remember another project that does something like >> that: >> > SQUIN http://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 >> >> >> >> > Thanks, >> > >> > >> > Martynas >> > graphityhq.com >> > ----------------------------- snip -------------------- >> >> >> > -- Prateek
Received on Wednesday, 19 March 2014 15:06:36 UTC