Обсуждение: deductive databases in postgreSQL

Carlos Gonzalez-Cadenas escreveu:
> We're looking for a deductive database for our application. Oracle, in
> the 11g version, has extended its RDBMS with deductive capabilities,
> supporting a subset of OWL-DL[1]. They are able to load an ontology,
> perform the inferences, dump the inferred info in the database and after
> that answer queries with the asserted plus the inferred info.
> 
> We would like to have similar functionalities in PostgreSQL. Do you know
> if there's someone working on that or if there are plans to support it
> soon?. If not, what do you think is the best and most efficient way of
> implementing it?
> 
No one that I know of. Well, it is a long road. The addition of a data type
xml is recent (8.3). We lack a set of features like indexing, a new data
structure (?), XQuery, XPath improvement and, so on [1]. Don't expect much of
these TODO items completed before the next two releases (unless you want to
take a stab).
After all of these basic infrastructure, we need a language (SPARQL?) and an
inference engine -- this is a big task AFAICT. At this point, don't know if
hackers will agree in adding such a big feature in core that is not SQL
standard (aka SQL/XML) but maybe it could be an external module.


[1] http://wiki.postgresql.org/wiki/XML_Todo


--  Euler Taveira de Oliveira http://www.timbira.com/

On Jan 22, 2009, at 8:24 AM, Euler Taveira de Oliveira wrote:
> No one that I know of. Well, it is a long road. The addition of a  
> data type
> xml is recent (8.3). We lack a set of features like indexing, a new  
> data
> structure (?), XQuery, XPath improvement and, so on [1]. Don't  
> expect much of
> these TODO items completed before the next two releases (unless you  
> want to
> take a stab).


You could also possibly pay a consulting company to implement it, but  
even that isn't as easy as it may sound. :)
-- 
Decibel!, aka Jim C. Nasby, Database Architect  decibel@decibel.org
Give your computer some brain candy! www.distributed.net Team #1828

On Fri, Jan 23, 2009 at 10:10:55AM +0100, Carlos Gonzalez-Cadenas wrote:
> Yes it's an option, but you cannot rely on the typical consulting company to
> do that. Do you know any specialized consulting boutique or individual
> developer that could do that?

Sending an email to pgsql-jobs@postgresql.org couldn't hurt.

--  Sam  http://samason.me.uk/

At the risk of excluding people...

I know that 2ndQuadrant and Command Prompt will develop features for  
hire. I'm not sure if EnterpriseDB will or not.

And yes, post is pgsql-jobs.

On Jan 23, 2009, at 3:10 AM, Carlos Gonzalez-Cadenas wrote:

> Yes it's an option, but you cannot rely on the typical consulting  
> company to do that. Do you know any specialized consulting boutique  
> or individual developer that could do that?
>
> Carlos Gonzalez-Cadenas
> CEO, ExperienceOn - New generation search
> http://www.experienceon.com
>
> Mobile: +34 652 911 201
> Skype: carlosgonzalezcadenas
> LinkedIn: http://www.linkedin.com/in/carlosgonzalezcadenas
>
>
>
> On Thu, Jan 22, 2009 at 7:16 PM, decibel <decibel@decibel.org> wrote:
> On Jan 22, 2009, at 8:24 AM, Euler Taveira de Oliveira wrote:
> No one that I know of. Well, it is a long road. The addition of a  
> data type
> xml is recent (8.3). We lack a set of features like indexing, a new  
> data
> structure (?), XQuery, XPath improvement and, so on [1]. Don't  
> expect much of
> these TODO items completed before the next two releases (unless you  
> want to
> take a stab).
>
>
> You could also possibly pay a consulting company to implement it,  
> but even that isn't as easy as it may sound. :)
> -- 
> Decibel!, aka Jim C. Nasby, Database Architect  decibel@decibel.org
> Give your computer some brain candy! www.distributed.net Team #1828
>
>
>

-- 
Decibel!, aka Jim C. Nasby, Database Architect  decibel@decibel.org
Give your computer some brain candy! www.distributed.net Team #1828