Revision keyword: committed and base

["Tim Liu (gangliu)" <ga...@cisco.com>]

Folks,
 
while understanding revision keyword,  I know BASE refers to working
space. HEAD refers to latest version in repository. but  I kind of
struggle to understand committed. your help is appreciated.
 
Does committed refer to repository or working space?
 
can somebody help me identify committed in the following example?
 
Step #1:
 
----23--------- [trunk]
 
Here HEAD is 23. BASE is 23. committed ??
 
Step #2: create a branch from trunk in working place
 
----23--------[trunk]
     |
     --------------- [my branch]
 
HEAD is 23. BASE is 23. committed ??
 
Step #3: a new revision in trunk 
 
----23--------24-------[trunk]
     |
     --------------- [my branch]
 
HEAD is 24. BASE is 23. committed ??
 
Step #4: a new revision in my branch 
 
----23--------24-------[trunk]
     |
     ---------25------ [my branch]
 
HEAD is 24. BASE is 23. committed ??
 
thx
 
Tim