Re: tools for inspecting rdf

while not specifically aimed at extracting more "statistical" information about RDF repositories, the Explorator ( allows you to explore the repository by directly operating on it. In other words, you can issue queries or compute set operations on its contents, without having to write code (or SPARQL) directly. There is a video that illustrates this.

It already contains some basic operations which answer some of your questions (ie., which and how many classes, predicates, etc... are used? ). 

Some of the more detailed analysis (e.g., do literals have languages/datatypes?)  would need special operators to be defined (available only in the more general version, the RExplorator,

The shortcoming, as pointed out in earlier messages in this list, is that currently it must issue queries to the repository to extract this information, which may easily overload it, if not done carefully..


On Mar 8, 2011, at 09:45  - 08/03/11, William Waites wrote:

> So you have some RDF data. What is it like? What
> vocabularies are used? Which classes or predicates
> are used and in what proportion? Do literals tend
> to have languages or datatypes? If so which ones?
> These types of questions are explored to an extent
> by the analysis done for the LOD cloud, but what 
> tools exist for answering these questions? Is it
> invariably roll your own or is there a program 
> that you can point at a SPARQL endpoint or RDF
> file and get a nice summary describing the nature
> of the data?
> Cheers,
> -w
> -- 
> William Waites                <>
>        <>
> F4B3 39BF E775 CF42 0BAB  3DF0 BE40 A6DF B06F FD45

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

Received on Tuesday, 8 March 2011 21:12:55 UTC