# TreeEvent
## Enum Variants
| TreeEventOneOf | Provided for backwards compatibility, it will be removed in the Canton version 3.4.0. Each tree event message type below contains a ``witness_parties`` field which indicates the subset of the requested parties that can see the event in question. Note that transaction trees might contain events with _no_ witness parties, which were included simply because they were children of events which have witnesses. |
| TreeEventOneOf1 | Provided for backwards compatibility, it will be removed in the Canton version 3.4.0. Each tree event message type below contains a ``witness_parties`` field which indicates the subset of the requested parties that can see the event in question. Note that transaction trees might contain events with _no_ witness parties, which were included simply because they were children of events which have witnesses. |
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