[Cocoon Wiki] Update of "ResourceExistsAction" by AlexanderKlimetschek

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The following page has been changed by AlexanderKlimetschek:
http://wiki.apache.org/cocoon/ResourceExistsAction

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  </map:pipeline>
  }}}
  
- However, if you wish to "fall-back" to a different pipeline if a file doesn't exist, you may use the !ResourceExistsAction:
+ However, if you wish to "fall-back" to a different pipeline if a file doesn't exist, you may use the !ResourceExistsAction. This action will run through it's embedded pipeline only when the resource given as 'url' parameter exists. Otherwise it won't do anything and the execution will continue below the action.
  
  (inspired from the [http://marc.theaimsgroup.com/?l=xml-cocoon-users&m=102188726924367&w=2 mailing list])