Instead of updating the whole software with a new version, sometimes the software is “patched”; i.e. only a part of it is replaced. The installation of such a patch can be implemented in the same way as the installation of a complete version. The only difference is that the result is not a new SoftwareRevision but an additional entry in the list of patch-identifiers stored in the PatchIdentifiers Variable (see 8.4.7.5).