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
To see the fulfillment of the work It is true that [the artist], like everybody else, derives remuneration from his work (though not, strictly speaking, profit in the financial sense, of the word, since what he invests in his work is not money but time and skill, whose returns cannot be calculated in percentages). The remuneration is frequently beyond the amount necessary to enable him to go on working. What is remarkable about him is the way in which he commonly employs the escape-from-work which the extra remuneration allows him. If he is genuinely an artist, you will find him using his escape-from-work in order to do what he calls “my own work”, and nine times out of ten, this means the same work (i.e. the exercise of his art) that he does for money. The peculiar charm of his escape is that he is relieved, not from the work but from the money. What distinguishes him here from the man who works to live is, I think, his desire to see the fulfilment of the work. Dorothy Sayers, The Mind of the Maker For its own sakeThe saddest designer craft