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.
acquired package info from repodata DB: repodata/4d599994fd9256dae4f9e002f043752d0d48d95d60499118b42a03cbc014043f-primary.sqlite.bz2