The smallest possible XMP (metadata file) is `<x:xmpmeta xmlns:x="adobe:ns:meta/"/>` (validated with [xmp ](https://www.pdflib.com/pdf-knowledge-base/xmp/free-xmp-validator/)validator)
The smallest possible XMP (metadata file) is
<x:xmpmeta xmlns:x="adobe:ns:meta/"/>(validated with xmp validator)