Re: How to find a proper ontology for my classes and properties?

Hi Juriy,

On Oct 30, 2010, at 12:40  - 30/10/10, Juriy Katkov wrote:

> Hello everyone! 
> I have 2 questions about rdf data. 
> ...
> 2. Suppose I face the dataset I never use before. What do you usually do first to get a first impression about the dataset? At the moment I first make some SPARQL queries to this dataset, such as: 
> select COUNT(?x) WHERE 
> {
> ?x a ?z .
> }
> 
> 
This is precisely what Explorator [1] is for. You add the SPARQL endpoint (Repositories menu item), and there are some ready-made queries (e.g, Classes, Properties), as well as a search function. There is an "SPO" operator that allows you to easily build queries of <s, p, o> patterns (see the video for examples).

[1] http://www.tecweb.inf.puc-rio.br/explorator

Best,
Daniel
----

Daniel Schwabe                      Dept. de Informatica, PUC-Rio
Tel:+55-21-3527 1500 r. 4356        R. M. de S. Vicente, 225<br>
Fax: +55-21-3527 1530               Rio de Janeiro, RJ 22453-900, Brasil
http://www.inf.puc-rio.br/~dschwabe