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/9fa7a97b004e6cd27df42fe8fada322769689e7d75b9392144123908e6bfdc23-primary.sqlite.bz2