---
title: Standard Protocol Output Keys
framework: quartz
role: collectionGroup
role_heading: API Collection
path: quartz/standard-protocol-output-keys
---

# Standard Protocol Output Keys

Output ports of a composition.

## Topics

### Constants

- [QCCompositionOutputImageKey](quartz/qccompositionoutputimagekey.md)
- [QCCompositionOutputWebPageURLKey](quartz/qccompositionoutputwebpageurlkey.md)

## See Also

### Constants

- [Attribute Keys](quartz/attribute-keys.md)
- [Composition Categories](quartz/composition-categories.md)
- [Standard Protocol Input Keys](quartz/standard-protocol-input-keys.md)
- [Standard Protocols](quartz/standard-protocols.md)