Raw

I just heard about a mapping from selected schema.org terms to SIOC (including a little FOAF and DC), it's a handful of statements using RDFS and OWL.

As one of the people responsible for the RDF Review Vocabulary I thought I should take a look what's needed there. It raises a couple of questions. As it happens, schema.org's model for reviews is a little more complex than our RDF vocab (after we went to all that trouble to keep it simple :), and a lot of the terms can't be mapped directly to well-known ones with RDFS/OWL.

e.g. in the RDF vocab:

<#something> :rating "5" .

using schema.org:

<#something> :reviewRating <#theRating> :ratingValue "5" .

So the first question is how best to express this? I think it's straightforward in SPARQL, e.g. for RDF vocab to schema.org for the terms above something like:

CONSTRUCT {

?something s:reviewRating [ :ratingValue ?value ]

} WHERE {

?something r:rating ?value

}

Or would some particular rule language be more appropriate?

The next question is how best to publish the mappings?

Where direct RDFS/OWL translation is possible, I think I'd be inclined towards including them in the RDF vocab, or at least linked via an rdfs:seeAlso.

Where rules are necessary, as above, I really haven't a clue. A simple online reasoning service could be useful (via some pre-cooked SPARQL maybe), but again how would you express that in the vocab?

I doubt I'll have chance to make the translations for Review in the near future (one contract I'm 7 weeks past deadline, another 3 weeks overdue, a couple of days overdue with those paper reviews...). But hopefully the lazyweb will be able to answer these questions in the interim.

That's a point - anyone fancy reimplementing lazyweb.org? It was very sweet, I think Ben only gave up on it due to lack of time to admin.

Oh yeah, and I still haven't implemented comments here yet, so for now please use email, Twitter, Facebook or Google+. (ooh, the Google+ link works properly for comments, but I guess non-G+ user can't comment...let me know if you want an invite)