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Weinberger's observation on metadata and data is spot on. Just this morning, I needed to find a website I'd viewed a few weeks ago when looking for a child seat to go on my mountain bike. Typing Child Seat into Google Desktop gave me exactly what I was looking for.

Not sure I agree on the expert authority vetting Wikipedia articles as a future layer though. Surely this adds expert authority back into the equation?

This reminds me of a time in the 70s when I was cataloguing an Integrated Science library and resource centre, with the aim of making cross-disciplinary resources available to student teachers teaching Integrated Science (rather than Physics or Chemistry or Biology). Looking back I realise that I developed what would now be called a tagging system: resources were shelved under a Dewey system to give them a physical location, and I added a huge card index under general science topics such as energy, waves, respiration, colour, so that it was easy to find a variety of resources for an integrated lesson.

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