Hierarchical faceting of URL

[tokee]

URLs conceptually represents entries in a hierarchy. An expandable structure could ease browsing:

http://foo.dk (1004)
http://bar.dk (500)
http://zoo.com (400)

clicking on foo.dk expands to

http://foo.dk (1004)
  - http://foo.dk/mypage.html (4)
  - http://foo.dk/substructure/ (900)
  - http://foo.dk/images/ (60)
  - ...
http://bar.dk (500)
http://zoo.com (400)

Clicking on substructure expands to

http://foo.dk (1004)
  - http://foo.dk/mypage.html (4)
  - http://foo.dk/substructure/ (900)
    - http://foo.dk/substructure/alabast/ (511)
    - http://foo.dk/substructure/logo.png (303)
    - http://foo.dk/substructure/logo_s.png (45)
    - ...
  - http://foo.dk/images/ (60)
  - ...
http://bar.dk (500)
http://zoo.com (400)