Semantic web is about making the meaning of your content easier for machines to extract. The idea is to have a single HTML document that is readable by people,

Semantic web is about making the meaning of your content easier for machines to extract. The idea is to have a single HTML document that is readable by people, but is also marked up with microformats or similar rich markup to enable easy acquisition of data by machine (i.e., without being dependent upon the structure of the HTML). The BBC's Programmes web site was a good example of this for some time, but I think this seems to have fallen by the wayside somewhat. Here's an instance though, where the broadcast times are marked up with XSD datetime information in addition to the human readable times: http://www.bbc.co.uk/programmes/b016ljx7/broadcasts http://www.bbc.co.uk/programmes/b016ljx7/broadcasts