A portal frontend service for Flatpak and other desktop containment frameworks.
xdg-desktop-portal works by exposing a series of D-Bus interfaces known as
portals under a well-known name (org.freedesktop.portal.Desktop) and object
path (/org/freedesktop/portal/desktop).
The portal interfaces include APIs for file access, opening URIs, printing and others.
Documentation about the Common Conventions, as well as documentation for App Developers, Desktop Developers and Contributors can be found here.