XMP Toolkit error 201 when decoding Leica Q2 DNG files

[dllu]

Describe the bug

When running exiv2 on Leica Q2 DNG files it says Error: XMP Toolkit error 201: Error in XMLValidator

exiv2 Leica\ -\ Q2\ -\ 14bit\ uncompressed\ \(3_2\).DNG
Error: XMP Toolkit error 201: Error in XMLValidator
Warning: Failed to decode XMP metadata.
File name       : Leica - Q2 - 14bit uncompressed (3_2).DNG
File size       : 87194624 Bytes
MIME type       : image/tiff
Image size      : 8424 x 5632
Thumbnail       : None
Camera make     : LEICA CAMERA AG
Camera model    : LEICA Q2
Image timestamp : 2019:04:14 08:20:41
File number     :
Exposure time   : 1/500 s
Aperture        : F6.3
Exposure bias   : 0 EV
Flash           : No, compulsory
Flash bias      :
Focal length    : 28.0 mm
Subject distance:
ISO speed       : 100
Exposure mode   : Aperture priority
Metering mode   : Center weighted average
Macro mode      :
Image quality   :
White balance   : Auto
Copyright       :
Exif comment    :

To Reproduce

1. Obtain direct-from-camera DNG file from a Leica Q2, e.g. from https://raw.pixls.us/getfile.php/3204/nice/Leica%20-%20Q2%20-%2014bit%20uncompressed%20(3:2).DNG
2. run exiv2 on it

Expected behavior

It should print the EXIF data without showing this error.

Desktop (please complete the following information):

• OS and version: Arch Linux
• Exiv2 version and source: exiv2 0.27.5 from Arch Linux official pacman repository
• Compiler and version: (e.g., Gcc 12.2, Clang 14.0.0, MSVC 2022)
• Compilation mode and/or compiler flags: (e.g., debug, -O3)

Additional context

Add any other information about the problem here.

[kmilos]

This is the same as #2126 and already fixed by #2133

Indeed:

$ ./exiv2 -px Leica\ -\ Q2\ -\ 14bit\ uncompressed\ \(3_2\).DNG
Xmp.xmp.Rating                               XmpText     1  0

Unfortunately not released yet, so you can test only by building the 0.27-maintenance (or main) branch yourself.