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An example of 
KeptPages. Say we are editing a page that was last edited in 1997, with an expiry timespan of one week:
Before
-  SamplePage
 -  This is content from 1997.
 
-  Revision history.
 -  empty.
 
After edit 1 at 3:43pm March 21, 2001
-  SamplePage
 -  This is content from March 21, 2001.
 
-  Revision history.
 -  [3:43pm March 21, 2001] This is content from 1997.
 
After edit 2 at 1:42am March 23, 2001
-  SamplePage
 -  This is content from March 23, 2001.
 
-  Revision history.
 -  [1:42am March 23, 2001] This is content from March 21, 2001.
 -  [3:43pm March 21, 2001] This is content from 1997.
 
After edit 3 at 7:02pm March 29, 2001
-  SamplePage
 -  This is content from March 29, 2001.
 
-  Revision history.
 -  [7:02pm March 29, 2001] This is content from March 23, 2001.
 -  [1:42am March 23, 2001] This is content from March 21, 2001.
 
-  Note that "This is content from 1997." has now expired.
 
Assuming no more edits, after 7:02pm, April 5, 2001
-  SamplePage
 -  This is content from March 29, 2001.
 
-  Revision history.
 -  empty.
 
In practice, it's best to leave at least one version behind for purposes of diffs, so at the end, we will have:
-  SamplePage
 -  This is content from March 29, 2001.
 
-  Revision history.
 -  [7:02pm March 29, 2001] This is content from March 23, 2001.