If true, the Android.Content.Context.GrantUriPermission(string, Android.Net.Uri, Android.Net.Uri) or corresponding Intent flags can be used to allow others to access specific URIs in the content provider, even if they do not have an explicit read or write permission. If you are supporting this feature, you must be sure to call Android.Content.Context.RevokeUriPermission(Android.Net.Uri, Android.Content.ActivityFlags) when URIs are deleted from your provider.

Must be a boolean value, either "true" or "false".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

[Android Documentation]