Olivier Grisel <[email protected]> escribió:
2011/8/17 <[email protected]>:
Olivier Grisel <[email protected]> escribió:
2011/8/17 <[email protected]>:
Hi again,
I've been looking the Dbpedia and DBLP examples, but actually i need to
define my own ontology with customised relations (not based in
definitions
of Dbpedia). I didn't explain my problem very well. I need to extract
tags
from plain text, yes, but i need to make inferences over my domain
(enterprise terms and concepts that are only used in a closed
environment).
What kind of inference? Please give an example of sample input and
expected output.
Input -> PTS is a component of a product for cleaning mowers.
Inference -> PTS is a product for gardening (i defined this in a
hierarchical ontology, superclass).
I don't get it: are the input and the output plain English text
(natural language) or RDF. Please give an example with the exact input
and output. Stanbol does not provide any component to generate natural
language.
Yes, the output would be something like this:
Entity->PTS
And the system could establish an inference:
Entity->Product_gardening
Is there any way to upload my ontology previously defined in Protégé with
mimetype rdf+xml? I thought that when i uploaded the owl file to a
specific
scope in ontonet, i could configure Stanbol to use this ontology.
What do you mean by "use"?
I want that Stanbol "forgets" another source. I need that, in the plain
text, Apache Stanbol choose tags only defined in my ontology.
You can configure the TaxonomyLinkingEngine to only point to use one
of the EntityHub referenced sites (and not all of them). Alternatively
you can unregister the configuration of dbpedia in the entityhub to
globally disable it.
Example:
I have a PTS but i don't have garden.
Result:
PTS->Component_for_mowers->Component_for_gardening
Apache Stanbol don't extract "garden" because it isn't defined like an
entity (class) in my owl file or my own ontology.
I've
already created this ontology. If it's not possible, what are the steps i
need to follow in Apache Stanbol to define own entities that Natural
Language Processing Engine can extract from plain text? And then, when
these
own entities has been extracted, how can i connect these entities with my
relations?
What do you mean by "connecting entities with relations"?
Relation:
Maybe_must_buy: Gardener->Component_for_gardening
So what you call a relation is a rule for a deductive reasoner?
Yes.
Example:
I have a PTS. Peter is a gardener.
Result:
PTS->Component_for_cleaning_mowers->Component_for_gardening
Peter->Gardener
Peter Maybe_must_buy PTS
Sorry for the example :). I expect you understand what i want to say.
So if I understand correctly you want to do compute all the
consequences (logical deductions) of the union of the logical facts
extracted from the natural language text of the submitted content with
a set of predefined rules registered on the Stanbol server.
The main problem I see is that right now we don't have any enhancement
engine in Stanbol able to semantically parse / interpret English
language content to extract "facts" or "semantic assertions". We just
have engines to extract occurrences of named entities and or non
ambiguous domain specific terms. This is a very non trivial task and
OpenNLP only provides some building block to implement this.
Thanks for your patience, Olivier.
--
Olivier
http://twitter.com/ogrisel - http://github.com/ogrisel
--
Jerónimo Fernández
Yerbabuena SW
