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There are several reasons to verify these. First of all we use these as filename elements, so we need to sure that dangerous things like "..", "/" etc don't appear in them. Secondly, we want to guarantee that app names are valid dbus well known bus names as they are used as app-ids in e.g. desktop files. We also want to enforce the app name as prefix for exported files to avoid conflicts. This means we disallow two-element names like "org.gnome", and we disallow "-" in app names, so that "-" can be used to separate the app name prefix from the rest of the filename. In particular, this is important for icons, like "org.gnome.app-symbolic.svg", where we want the only valid prefix to be org.gnome.app.