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AppStream 0.9


Infrastructure for distro-agnostic software-centers and software metadata handling

Edition 1

Matthias Klumpp


Michael Vogt

Canonical / Ubuntu / Debian

Richard Hughes

Fedora / Red Hat

Vincent Untz


Legal Notice

Copyright © 2012-2016 Matthias Klumpp. This material may only be distributed subject to the terms and conditions set forth in the GNU Free Documentation License (GFDL), V1.2 with no invariant sections or later (the latest version is presently available at


AppStream is a cross-distro effort for enhancing the way we interact with the software repositories provided by the distribution by standardizing sets of additional metadata.
AppStream provides the foundation to build software-center applications. It additionally provides specifications for things like an unified software metadata database, screenshot services and various other things needed to create user-friendly application-centers for (Linux) distributions.
1. About AppStream
1.1. What is AppStream?
2. Upstream Metadata
2.1. Generic Component
2.2. Desktop Applications
2.3. Addons
2.4. Fonts
2.5. Codecs
2.6. Input Methods
2.7. Firmware
3. Distribution Metadata and Services
3.1. AppStream distribution XML files
3.2. Debian DEP-11 specification
3.3. Icon Cache
4. Metadata Quickstart
4.1. For GUI application upstream maintainers
4.2. For upstream projects providing addons
4.3. Translating Metadata
5. Services
5.1. Screenshot service
5.2. Url handler
6. Manual pages
7. AppStream API Reference