Thanx for the explanation. The problem is not about the length of urls as such. The reason I want those urls is that pages or articles can be moved from on parent page to another. For example, I have a parent page, say, Poetry and I publish a child page with American poets' stuff, then in the future I may want to divide poetry into American, European etc. poetry pages. Then I have to move my page to the American poetry which is child of the Poetry. In this case my url will be different. I want to avoid it.