Bassam,
As a professional in this field, I want to suggest that SPARQL Federated Query
is not widely used in the field. Think about how this affects inferencing -
unless the federating server has some way of knowing which vocabulary to
associate with a remote graph, there is no way to do inferencing. Think also
about Distributed Systems Theory in general – how should your SPARQL endpoint
behave when another SPARQL endpoint is not responding or is slow? From a
distributed systems theory perspective, stopping failures such as “not
responding” are much, much more tractable than non-conformant/random behavior.
There is an analogous problem in distributed Information Retrieval (IR), e.g.
text search. It is common for cooperating search servers to communicate Term
Frequency (TF) and Document Frequency(DF) on each search server among cluster
members so that distributed relevancy may be calculated (usually described as
TF-IDF). With true Federated Search/Meta-search, this isn’t possible, and so
search relevancy suffers. It has given federated search rather a black eye
although there are many scholarly articles about it.
In the semantic web, the common solution is to offer both a download of TTL,
RDF, or NTriples and have other SPARQL endpoints include your downloads, as
Hugh Williams suggests. Although my semantic web site,
http://id.nlm.nih.gov/mesh is a beta and likely to remain that way, we offer
downloads of NTriples files at ftp://ftp.nlm.nih.gov/online/mesh.
Dan Davis, Systems/Applications Architect (Contractor),
Office of Computer and Communications Systems,
National Library of Medicine, NIH
From: Hugh Williams [mailto:hwilli...@openlinksw.com]
Sent: Monday, November 16, 2015 8:59 AM
To: Eng.Bassam <bassa...@gmail.com>
Cc: virtuoso-users@lists.sourceforge.net
Subject: Re: [Virtuoso-users] federated SPARQL queries?
Hi Bassam,
I assume your ontology is already in RDF format, in which case see the
following article on how to import/load and Ontology into Virtuoso:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtTipsAndTricksGuideImportOntology
or generally you can use any of the many methods of insert/load/import’ing RDF
data into Virtuoso detailed at:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFInsert
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
Weblog -- http://www.openlinksw.com/blogs/
LinkedIn -- http://www.linkedin.com/company/openlink-software/
Twitter -- http://twitter.com/OpenLink
Google+ -- http://plus.google.com/100570109519069333827/
Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology Providers
On 16 Nov 2015, at 07:48, Eng.Bassam
<bassa...@gmail.com<mailto:bassa...@gmail.com>> wrote:
Hi
I'm Bassam a software engineer, I'm preparing master thesis in semantic web
I have my medical data in virtuoso and want to link my data to external
ontology for diseases,
how can I do that :
must upload the ontology in virtuoso server, if yes how do that?
my objective is make federated SPARQL queries to traversal on my data also
diseases ontology
thanks.
--
-----------------------------------
> Eng.Bassam Najeeb.
>Software Engineer.
------------------------------------------------------------------------------
Presto, an open source distributed SQL query engine for big data, initially
developed by Facebook, enables you to easily query your data on Hadoop in a
more interactive manner. Teradata is also now providing full enterprise
support for Presto. Download a free open source copy now.
http://pubads.g.doubleclick.net/gampad/clk?id=250295911&iu=/4140_______________________________________________
Virtuoso-users mailing list
Virtuoso-users@lists.sourceforge.net<mailto:Virtuoso-users@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/virtuoso-users
------------------------------------------------------------------------------
Presto, an open source distributed SQL query engine for big data, initially
developed by Facebook, enables you to easily query your data on Hadoop in a
more interactive manner. Teradata is also now providing full enterprise
support for Presto. Download a free open source copy now.
http://pubads.g.doubleclick.net/gampad/clk?id=250295911&iu=/4140
_______________________________________________
Virtuoso-users mailing list
Virtuoso-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/virtuoso-users
