[mapguide-trac] #729: Add support for flagging base map tile cache never to be purged

[MapGuide Open Source]

#729: Add support for flagging base map tile cache never to be purged
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   Reporter:  zspitzer      |       Owner:       
       Type:  enhancement   |      Status:  new  
   Priority:  medium        |   Milestone:       
  Component:  Tile Service  |     Version:  2.0.2
   Severity:  major         |    Keywords:       
External_id:                |  
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 A fully seeded tile cache can take a long tile to generate and can be
 extremely easily purged via simply updating one of the related layers or
 feature sources.

 There should be an option to set a flag on the map's resource header which
 prevents any purging of the tile cache by changes to related layers

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/729>
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