Cool URIs don’t change. Designing
Cool URIs don’t change. Designing clear URIs
It the the duty of a Webmaster to allocate URIs which you will be able to stand by in 2 years, in 20 years, in 200 years. This needs thought, and organization, and commitment.
URIs change when there is some information in them which changes. It is critical how you design them. (What, design a URI? I have to design URIs? Yes, you have to think about it.). Designing mostly means leaving information out.