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# MergeableDocument

Documents conforming to this protocol can merge several
copies of the document into a single document.

```
protocol MergeableDocument : MergeablePartsContainer, Identifiable
```

## Topics

### Getting the pages

[`var pages: [Self.Page]`](/documentation/Assignables/MergeableDocument/pages)

The collection of pages in this document.

[`associatedtype Page : MergeableDocumentPage`](/documentation/Assignables/MergeableDocument/Page)

The page type this document contains.

### Exporting the layers

[`func exportToPDF(visibleParts: [Self.PartID]) async -> PDFDocument`](/documentation/Assignables/MergeableDocument/exportToPDF(visibleParts:))

Exports the indicated layers of this document into a single
`PDFDocument`.

### Exporting the thumbnails

[`func pageThumbnails(visibleParts: [Self.PartID]) async -> [Self.Page.ID : Self.Page.Thumbnail]`](/documentation/Assignables/MergeableDocument/pageThumbnails(visibleParts:))

Exports thumbnails of each page such that the
thumbnails contain the indicated layers.

### Getting the error type

[`associatedtype Error : Error`](/documentation/Assignables/MergeableDocument/Error)

The error type for this type.

## Relationships

### Inherits From

[`Identifiable`](/documentation/Swift/Identifiable)

[`MergeablePartsContainer`](/documentation/Assignables/MergeablePartsContainer)

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

### Conforming Types

[`AssignedWorkDocument`](/documentation/Assignables/AssignedWorkDocument)

[`AssignableDocument`](/documentation/Assignables/AssignableDocument)

---

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