Cross-platform tests. (Mono XML still incompatible with XDT.)
Cross-platform tests. (Mono XML still incompatible with XDT.)

The Mono implementation of System.Xml.XmlAttribute.set_Prefix
is still incompatible with XDT because it's behavior when set to
null does not match .NET.
See https://bugzilla.xamarin.com/show_bug.cgi?id=19426

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