# MessageDeltaContentTextAnnotationsFileCitationObject
## Properties
**index** | **i32** | The index of the annotation in the text content part. |
**r#type** | **String** | Always `file_citation`. |
**text** | Option<**String**> | The text in the message content that needs to be replaced. | [optional]
**file_citation** | Option<[**models::MessageDeltaContentTextAnnotationsFileCitationObjectFileCitation**](MessageDeltaContentTextAnnotationsFileCitationObject_file_citation.md)> | | [optional]
**start_index** | Option<**i32**> | | [optional]
**end_index** | Option<**i32**> | | [optional]
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