> ## 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.

# BookParentChild

The **BookParentChild** store is the source of the builder for the [BookHierarchy](./bookhierarchy) store.
It is an isolated store and not part of any cube facts.

It contains the structure of the book hierarchy
It is indexed by **Child** and **AsOfDate**.

| Store Field | Key | CanBeNull | Type (+Default Value - if applicable) | Description                                              |
| ----------- | --- | --------- | ------------------------------------- | -------------------------------------------------------- |
| Child       | Y   |           | String                                | Name of the node in the Book/Desk hierarchy.             |
| Parent      |     |           | String                                | Name of the parent node (or null if there is no parent). |
| AsOfDate    | Y   |           | LOCALDATE\[yyyy-mm-dd]                | Timestamp (at close of business) for the data.           |