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This feature can update an installed package , to remove superfluous files after an installation.

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Includes and excludes can be defined as filesets, but no file name mappers can be used.

$INSTALL_PATH is treated as the base path for include/exclude patterns with relative paths.

Example:

<updatecheck>
  <include name="lib/**" />
  <exclude name="config/local/** />
</updatecheck>

This causes files in $INSTALL_PATH/lib to be deleted and files in the $INSTALL_PATH/config sub-folder to be retained.

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 .are deleted in $INSTALL_PATH

Be careful with this facility to not delete 3rd-party files coming from other installations, for instance plugins to a base application.

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<updatecheck>
  <include name="lib/**" />
  <exclude name="config/local/** <updatecheck/>
</updatecheck>

This causes all files in $INSTALL_PATH is treated as the base path for include/exclude patterns with relative paths  that were not installed in the current installation to be deleted.