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# Standard Protocol Output Keys

Output ports of a composition.

## Topics

### Constants

[`QCCompositionOutputImageKey`](/documentation/Quartz/QCCompositionOutputImageKey)

An image output port whose key is `outputImage`.

[`QCCompositionOutputWebPageURLKey`](/documentation/Quartz/QCCompositionOutputWebPageURLKey)

A string output port whose key is `outputWebPageURL`.


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