The problem with trees Many systems are organized hierarchically. The CERNDOC documentation system is an example, as is the Unix file system, and the VMS/HELP system. A tree has the practical advantage of giving every node a unique name. However, it does not allow the system to model the real world. For example, in a hierarchical HELP system such as VMS/HELP, one often gets to a lead on a tree such as: HELP COMPILER SOURCE_FORMAT PRAGMAS DEFAULTS only to find a reference to another leaf: Please see HELP COMPILER COMMAND OPTIONS DEFAULTS PRAGMAS and it is necessary to leave the system and re-enter it. What was needed was a link from one node to another, because in this case the information was not naturally organized into a tree. Tim Berners-Lee, Seeing With Fresh Eyes A City Is Not a Tree hierarchywww
Cool URIs don't change An Essay by Tim Berners-Lee www.w3.org What makes a cool URI? A cool URI is one which does not change. What sorts of URI change? URIs don't change: people change them. The User Interface of URLs www
Candide A Novel by Voltaire Things cannot be other than as they areWe must cultivate our garden Your new electronic microscope
Things cannot be other than as they are “It is demonstrably true that things cannot be other than as they are. For, everything having been made for a purpose, everything is necessarily for the best purpose.” — Professor Pangloss purposemeaning
We must cultivate our garden ‘You must have a vast and magnificent estate,’ said Candide to the turk. ‘I have only twenty acres,’ replied the old man; ‘I and my children cultivate them; and our labour preserves us from three great evils: weariness, vice, and want.’ Candide, on his way home, reflected deeply on what the old man had said. ‘This honest Turk,’ he said to Pangloss and Martin, ‘seems to be in a far better place than kings…. I also know,’ said Candide, ‘that we must cultivate our garden.’ lifegardens