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
Barn Burning A Short Story from The Elephant Vanishes by Haruki Murakami The first in agesFive barns worth burningI keep getting older
The first in ages “Can I ask you one more question?” “Sure.” “Have you already decided on the next barn to burn?” This caused him to furrow up wrinkles between his eyes; then he inhaled audibly through his nose. “Well, yes. As a matter of fact, I have.” I sipped the last of my beer and said nothing. “A great barn. The first barn really worth burning in ages. Fact is, I went and checked it out only today.” “Which means, it must be nearby.” “Very near,” he confirmed. So ended our barn talk. i
Five barns worth burning I walked around with a map, penciling in X’s wherever there was a barn or shed. For the next three days, I covered four kilometers in all four directions. Living toward the outskirts of town, there are still a good many farmers in the vicinity. So it came to a considerable number of barns—sixteen altogether. I carefully checked the condition of each of these, and from the sixteen I eliminated all those where there were houses in the immediate proximity or greenhouses alongside. I also eliminated those in which there were farm implements or chemicals or signs that they were still in active use. I didn’t imagine he’d want to burn tools or fertilizer. That left five barns. Five barns worth burning. barnsworthburning.net i
I keep getting older Every morning, I still run past those five barns. Not one of them has yet burned down. Nor do I hear of any barn fires. Come December, the birds strafe overhead. And I keep getting older. Although just now and then, in the depths of the night, I’ll think about barns burning to the ground. i