[1]

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="3.1.1-111">

(名無しさん [sage])

[2]

<x:xmpmeta xmlns:x='adobe:ns:meta/'>

[3] (2014-05-20 08:21:03 +09:00 版) <http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/xmp/pdfs/cc-201306/XMPSpecificationPart1.pdf>