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If you want to update the contents of a corpus in Globalese, you have two options: either re-import it if it originates from a CAT tool, or upload the changed corpus manually:
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Each time you update an existing corpus, the version number of the corpus will automatically be incremented. You can see the version history of a corpus on the appropriately named Versions tab.
Updating an existing corpus does not affect the engines that were previously trained on the corpus. You will need to retrain the engines for the additions, deletions and changes to take effect.