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.shtmlSQUIN 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? -- Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog: http://www.openlinksw.com/blog/~kidehen Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen
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