Re: Subjects & Tagging - Help?

> 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