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
The Abode of Fancy The name, Abode of Fancy, implies a structure created to meet some individual artistic requirement. The tea room is made for the tea master, not the tea master for the tea room. It is not intended for posterity and is therefore ephemeral. The idea that everyone should have a house of his own is based on an ancient custom of & the Japanese race, Shinto superstition ordaining that every dwelling should be evacuated on the death of its chief occupant. Perhaps there may have been some unrealized sanitary reason for this practice. Another early custom was that a newly built house should be provided for each couple that married. It is on account of such customs that we find the Imperial capitals so frequently removed from one site to another in ancient days. Okakura Kakuzō, The Book of Tea Poems of an Indian summerEach ruler commissioned his own gardenIse Shrines, Nagoya, 685–Present home