[Tapestry Wiki] Trivial Update of "SessionPagePersistence" by BobHarner

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The "SessionPagePersistence" page has been changed by BobHarner.
The comment on this change is: outdated note.
http://wiki.apache.org/tapestry/SessionPagePersistence?action=diff&rev1=6&rev2=7

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+ || NOTE: This is outdated information that applies only to Tapestry 4. For current information on page-level persistence, see http://tapestry.apache.org/persistent-page-data.html ||
+ 
  Tapestry's session persistence is great, but some times you just want a value to work like a "session page instance variable" - only around while the user is working within a page (calling listener methods on that page, but not rendering any other page).  This strategy avoids all the problems of using real instance variables in a page object.
  
  Values are discarded if the last page rendered was not the same as the current page being rendered (see below for another implementation).

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