Bill Roberts wrote:
Finally, regarding dc:subject, a tag can be used not as a subject
(think of a webpage tagged "cool" or "todo", they are probably not
used as subject) so the semantics of dc:subject is probably not what
you want here.
I think this comment from Alexandre gets to the core of the matter.
Tagging has grown up as a kind of "metadata-lite", ie a quick way of
categorising blog posts etc into topics, often fairly broad topics. Of
course it can be a very useful way of finding related material. However
if you are able to say something more precise, then I think you should -
eg by using dc:subject or foaf:primaryTopic, to say that a blog post (or
other document) is about a particular thing that you have a URI for.
You might also want to have tags of course, in their role of more
general categorisation and the Common Tag ontology looks a nice way to
handle that, especially with its capabilities for saying which user
added a tag - so letting you handle an applicatoin like delicious.com.
Cheers
Bill
Thank you all,
and.. sorry to keep asking! However I still don't feel like I've got
this down yet; I can follow most ontologies, and most custom / common
data sets are pretty simple to map; geo data is geo data, a person is a
person with a name etc - however pretty rapidly a huge chunk of data
will be going in to the cloud from all the "bloggers" out there, and
dev's making CMS systems; and if we don't have a standard way of
associating our content that's well known then.. well most of the data
(masses of it) will be pretty much junk I guess.
so.. to nail this once and for all, can we take the following article:
http://www.google.com/hostednews/afp/article/ALeqM5hU45P_cGaJc9YjXHHpDrNf9VBuWg
and the following (auto) extracted subjects/terms/tags (each with a uri
for the dbpedia resource, and in the case of countries a uri for the geo
resource too)
topics
Foreign relations of Iran
Science and technology in Iran
Iran – United States relations
Politics of Iran
Nuclear program of Iran
Enriched uranium
people
Barack Obama
Dmitry Medvedev
Ali Asghar Soltanieh
Nicolas Sarkozy
orgs
United Nations
International Atomic Energy Agency
White House
geo
Iran
Tehran
United States
Moscow
France
Qom
In your opinion(s) what would the relevant triples be to correctly
associate the content to these resources (remember I have the relevant
URIs for each literal above); primary consideration of course goes to
the ontologies people would use to find this data in the future.
Many thanks in advance, I can assure you any time spent on this bit of
guidance won't be wasted.
Nathan
