xAPI Extensions
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| Extensions                                                  | Title                    | Description                                                                                                                                                                                                          |
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| https://w3id.org/xapi/openedx/extension/transformer-version | "transformer version"@en | "Transformer version will be defined by three non-negative integers X, Y and Z representing major, minor and patched  version respectively prefixed with `event-routing-backends@` eg.  event-routing-backend@X.Y.Z" |
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