|  | ## Flatten Collection

#### Synopsis

Receives a collection of collections and unions all content into a single collection.

#### Description

This operator receives a collection of collections and unions the content of each collection into a single collection. If your collection contains three collections which contain 5 IOObject the result will be a single collection with 15 IOObjects. After merging objects into a collection, the Loop Collection operator can be used to iterate over this collection. The Select operator can be used to retrieve a certain element of the collection. Note: In the process layout view, collections are indicated by double lines.

#### Input

- collection: expects: IOObject

#### Output

- flat:

#### Parameters

#### ExampleProcess