FAQ #75 describes three:
- lj:user/exampleusername, which becomes http://www.livejournal.com/users/exampleusername/
- lj:support/foo, which becomes http://www.livejournal.com/support/see_request.bml?id=foo (where foo is a number)
- lj:faq/bar, which becomes http://www.livejournal.com/support/faqbrowse.bml?faqid=bar (where bar is a number)
There are others, too:
- lj:user/exampleusername/blahblahblah/foobarbaz, which becomes http://www.livejournal.com/users/exampleusername/blahblahblah/foobarbaz
- lj:user/exampleusername/profile, which becomes http://www.livejournal.com/userinfo.bml?user=exampleusername
- lj:support, which becomes http://www.livejournal.com/support/
- lj:faq, which becomes http://www.livejournal.com/faq.bml
- lj:, which becomes http://www.livejournal.com/
(Anything beginning with lj: that isn't recognized will become http://www.livejournal.com/.)
Is there a reason these aren't in the FAQ?
1. It's a minor point, but these aren't really "URL forms," since a URL is a Uniform Resource Locator. (Unless "URL form" is meant to mean "code that has the 'form' of a URL"?)
2. They only work when they're the value of an element's href attribute (so they won't autolinkify). Is that worth mentioning?