Regarding 'sioc:topic' and 'sioc:subject':

SIOC has 2 properties in order to express both between text keywords =
literals and tags/categories/keywords that can be expressed using a
URI. Using a URI (and sioc:topic) is preferred and in a majority of
cases a site already has some kind of URI for each tag/category.

About sioc:subject - it has the same meaning as dc:subject therefore
(as part of aligning SIOC with DC) we can drop this property and use
dc:subject instead.

> So, for a given topic, we could do both:
>
> > rdf:resource="http://apassant.net/blog/tag/thinkpad"/> as in current
> export API
>
> or
>
> thinkpad
> as I've done in Drupal API

Second RDF snippet is invalid - you may not use rdf:about with a
property.

> Actually, and as discussed with Christoph on IRC, I think sioc:subject
> should be used for (free) tagging, with rdf:about to link to the page
> containing all the post with the same subject, and that we should keep
> sioc:topic to link to SIOC concept or domain ontology resources.
> That's what I've done so far with to distinguish tags free tags and
> ontology concepts in posts indexing.

As we agreed on IRC let's use sioc:topic to link to a URI when we can.
And have dc:subject in our "arsenal" for cases when a URI can't be
figured out.

A more philosophical question: is there a need to distinguish between
free tags and ontology concepts? Free tags are like a dynamic and very
flat taxonomy and there is not much difference in how they are used.
This may be similar to our previous discussion about Posts and Comments
- the difference is technical, not so much conceptual.

Uldis

[ http://captsolo.net/info/ ]

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