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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title xmlns:d="http://docbook.org/ns/docbook">Chapter 1. About AppStream</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta xmlns:d="http://docbook.org/ns/docbook" name="generator" content="publican v4.3.2" /><meta xmlns:d="http://docbook.org/ns/docbook" name="package" content="AppStream-AppStream-0.9-en-US-0.0-0" /><link rel="home" href="index.html" title="AppStream" /><link rel="up" href="index.html" title="AppStream" /><link rel="prev" href="index.html" title="AppStream" /><link rel="next" href="chap-Metadata.html" title="Chapter 2. Upstream Metadata" /></head><body><p id="title"><a class="left" href="http://www.freedesktop.org/wiki/Distributions/AppStream/"><img alt="Product Site" src="Common_Content/images//image_left.png" /></a><a class="right" href="http://www.freedesktop.org/software/appstream/docs/"><img alt="Documentation Site" src="Common_Content/images//image_right.png" /></a></p><ul class="docnav top"><li class="previous"><a accesskey="p" href="index.html"><strong>Prev</strong></a></li><li class="home">AppStream</li><li class="next"><a accesskey="n" href="chap-Metadata.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="chapter" lang="en-US"><div class="titlepage"><div><div><h1 class="title"><a id="chap-AppStream-About">
</a>Chapter 1. About AppStream</h1></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="chap-AppStream-About.html#about-whatis">1.1. What is AppStream?</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="about-whatis">
</a>1.1. What is AppStream?</h2></div></div></div><div class="para">
AppStream is a cross-distro effort for ehnacing the metadata available about software components in the Linux and free-software ecosystem. One of the project's goals is to make building software-center applications possible, and make interaction with the package sources of a distribution smarter. AppStream provides specifications for meta-information which is shipped by upstream projects and can be consumed by other software. The meta-information includes data which is interesting to display in software centers and is mainly useful for end-users, as well as descriptions about the public interfaces a software component provides, which is mainly useful for developers, 3rd-party software installers and for automatically installing missing components on a distribution, for example missing firmware or mimetype-handlers.
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Distributors provide metadata as well, which describes all components available in a software repository. That data is composed of the upstream-metainfo and some other sources. AppStream also provides specifications for things like a screenshot-service, application ratings & reviews etc. All AppStream distro-repository data is stored in a Xapian database, which then contains information about all available components in the distribution's software repositories.
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All parts of AppStream are distro-agnostic (with exception to some metadata which is used to generate the Xapian application cache), and therefore AppStream makes it possible to build distro-agnostic application management tools.
</div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm140716983051920">
</a>1.1.1. Architecture</h3></div></div></div><div class="para">
<div class="mediaobject"><img src="images/architecture.png" /></div>
</div></div></div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="index.html"><strong>Prev</strong>AppStream</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="chap-Metadata.html"><strong>Next</strong>Chapter 2. Upstream Metadata</a></li></ul></body></html>
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