> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Book description

Download sample file: [BookDescription.csv](../assets/csv/BookDescription.csv)

This file provides a description of books.

This Book Description file type is identified using the pattern: **`**/{BookDescription,BookDescription}*.csv{,.gz}`** (as specified by book-description.file-pattern). A sample file is `BookDescription`. This file is loaded using the **BookDescription** topic. See the [Topic Aliases table](../dev/dev-ref-impl/dev-dlc/dlc-frtb-config#topic-aliases) for an understanding of the topic aliases associated with each topic.

|           |         |          |                   |                                                                                                                                                                                                                                                                                                                                                                          |             |
| --------- | ------- | -------- | ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------- |
| **Field** | **Key** | **Null** | **FieldType**     | **Description**                                                                                                                                                                                                                                                                                                                                                          | **Example** |
| Book      | Y       | N        | String            | Name of the Book.                                                                                                                                                                                                                                                                                                                                                        |             |
| Desk      | N       | Y        | String            | Name of the Desk to which the Book belongs.                                                                                                                                                                                                                                                                                                                              |             |
| AsOfDate  | Y       | N        | Date ‘YYYY-MM-DD’ | Timestamp (at close of business) for the data.                                                                                                                                                                                                                                                                                                                           |             |
| IRT Flag  | N       | Y        | ‘Y’ or ‘N’        | Indicates whether the desk is an Internal Risk Transfer (IRT) desk. ACR is calculated separately for desks flagged as IRT. Defaults to ‘N’ To support multiple jusrisdictions (where the collection of books in the IRT desk for the group might be different from those for the local legal entities), you can use the [IRT Desk Groups](./irt-desk-groups) input file. |             |

These files are expected to include all combinations of "Book", "IRT Group", and "AsOfDate".