It's really hard to search for related documents for example. The semantic web means that all the stuff out there has metadata with it that describes it. Don't think so, Jose. The resource description Framework is an XML-like standard for defining vocabularies that define metadata. These vocabularies can then be used to describe documents.
Market forces decide which ones get popular.
The future This is all of little consequence to web developers right now. But anyone involved in content management should watch this space, interesting times are ahead. The category a library classifies a book in is metadata about that book. The title argument of an tag is metadata. Rating This article currently has a rating of 3.4 out of 5 total ratings.