とりあえず自分の足したとこでテスト失敗してるわけではなさそうだったので、さっさとPR出しちゃいました。 https://github.com/apple/swift-corelibs-foundation/pull/2313

XML: Add namespace support for XML attributes by hironytic · Pull...

Implement XMLElement.attribute(forLocalName:uri:). Also fix some other incompatibilities between Linux and Darwin about attributes with namespace. In the added test case, all expected values are ac...