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This feature can update an already installed package, therefore removing to remove superfluous files after an installation.
Each pack can now specify an <updatecheck> tag that indicates which files are to be retained or deleted.
Includes and excludes can be defined as filesets, but no file name mappers can be used. If no include or exclude pattern is given all files are deleted in $INSTALL_Path on the target system, which were not part of the setup.
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