> Decorated URLs in the MKS style may suffice for the simple versioning > needs. But I suspect we'll want to look at an additional HTTP method -- > call it SET_CONFIG -- to tell a server, "Now switch to serving the > 'tables-no-frames' version of the pages." Keith, I would suggest that the idea is appropriate, but the example is ill-chosen. The "tables-no-frames" version of the pages would, presumably, be selected by the server based on the content negotiation. More appropriate, especially for information providers (like http://www.economist.com), would be a way to tell the server to "let me browse the May 4 edition of the site". Whether we ever get to that level or not remains to be seen. And, to emphasize, I don't consider the URL decorations to be nothing more than an easy way to generate links to old revisions of individual files. However, such an ability is, I think, a critical component of any larger system and clearly something well-defined that we can start with before moving on to the more contentious issues. - David