On 6/18/11 6:58 AM, Aliabbas Petiwala wrote:
we are looking forward to make an OWL ontology database as a mirror of
a relational database for an upcoming social network semantic website
is it a good decision to make?
actually we can go for three options:
1. complete owl database, no relational db
2. owl mirror of relational db
3. only relational
we are very much interested in the second option is it wise to use
mirror of ontology database as a relation database? how can owL
Ontology database be efficient than a relational one considering that
we will need to query a lot of external databases like
dbpedia,freebase etc?
for the second option, ontological databases requires us to make a
query against hundreds of different schemata and classes properties
which seems to be a costly affair. And is it a wise decision to go for
a complete ontological database for a social networking website ? The
project is involves sharing of lot of small chunks of information
across an array of distributed users building a personalized model of
the user.
ontotext, http://www.systap.com,http://www.opencalais.com/ provides a
solution for semantic repositories , its really difficult to determine
which is the best option for a STARTUP like us and we can't go in for
these expensive paid consultations. so what are the options and
solutions availaible for us?
Take a look at options for generating Linked Data graphs from RDBMS
sources that include ability to exploit OWL based inference
functionality at scale. There is a state of art resource [1] that shed
light into this matter.
Speaking for Virtuoso (our product) it will produce an OWL ontology from
an RDBMS schema which can be mapped to other shared
schemas/vocabularies/ontologies. You can exploit inference rules via a
backward-chaining reasoner. To take full advantage of this you have to
use a hybrid or transient and materialized linked data views derived
from your RDBMS data sources. Anyway, doing all of that is just a Wizard
option as View generation time. In addition, we also now have support
for R2RML (which is just a mapping to our old Meta Schema Language for
doing the same thing).
Links:
1. http://www.w3.org/wiki/Rdb2RdfXG/StateOfTheArt -- RDBMS to RDF state
of art
2. http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSSQL2RDF --
a little dated but generally reflective start point for information
about Virtuoso's Linked Data views capability atop heterogeneous ODBC or
JDBC accessible RDBMS data sources
3.
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtRdb2RDFViewsGeneration#OneClickLinkedDataGenerationAndDemployment
-- Wizard based generation of Linked Data views atop ODBC / JDBC
accessible RDBMS data sources.
--
Regards,
Kingsley Idehen
President& CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
