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
When our forces are resolved When a person’s forces are resolved, it makes us feel at home, because we know, by some sixth sense, that there are not other unexpected forces lurking underground. He acts according to the nature of the situations he is in, without distorting them. There are no guiding images in his behavior, no hidden forces; he is simply free. And so, we feel relaxed and peaceful in his company. Each of us knows from experience the feeling which this quality creates in us. And for this reason, each one of us can also recognize this quality when it occurs in buildings. Christopher Alexander, The Timeless Way of Building The doctrine of salvation by bricksA sense reflected in the plans happiness