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
1º2º3º4º Because the approach to the room is along a long corridor, the attentive visitor might at first think that three light squares had been affixed to the windows or, as one gradually came closer, that the tinting of the windows had simply been removed in these three lighter near-square areas. Davies continues: "only at this point do the other senses kick in. The visitor begins first to hear and smell the ocean and then to actually feel the outside air entering the gallery; this sensory experience is in complete contradiction to the faulty first impression." Robert Irwin, Robert Irwin: A Conditional Art The inhumanity of contemporary architecture senseswindows