AI-generated Key Takeaways
- 
          Describes a single operation on a campaign criterion: create, update, or remove. 
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          The update_maskfield determines which resource fields are modified during an update operation.
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          The operationfield specifies the type of mutate operation to perform: create, update, or remove.
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          Create operations do not require a resource name for the new criterion. 
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          Update operations require a valid resource name for the criterion being modified, with limitations for smart campaigns. 
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          Remove operations require a resource name in a specific format for the criterion being removed. 
A single operation (create, update, remove) on a campaign criterion.
| Fields | |
|---|---|
| 
 | FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new criterion. | 
| 
 | Update operation: The criterion is expected to have a valid resource name. Note that for smart campaigns, you cannot use the update method to edit the geolocation target. | 
| 
 | 
 Remove operation: A resource name for the removed criterion is expected, in this format: 
 |