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Description of problem:
appstream-util fails to validate mkvtoolnix appstream metadata, complaining about unknown <url> type.

Version-Release number of selected component (if applicable):
libappstream-glib-0.7.8-2.el7

How reproducible:
Always

Steps to Reproduce:
1. wget https://gitlab.com/mbunkus/mkvtoolnix/-/raw/master/share/metainfo/org.bunkus.mkvtoolnix-gui.appdata.xml
2. appstream-util validate-relax --nonet org.bunkus.mkvtoolnix-gui.appdata.xml 

Actual results:
org.bunkus.mkvtoolnix-gui.appdata.xml: FAILED:
? tag-invalid           : <url> type invalid [unknown]
Validation of files failed

Expected results:
org.bunkus.mkvtoolnix-gui.appdata.xml: OK

Additional info:
This works on Fedora 31 (libappstream-glib-0.7.17-1.fc31.x86_64).

I don't think there is any plan to update appstream-glib in RHEL 7, and certainly not for z-stream -- sorry.

Development Management has reviewed and declined this request. You may appeal this decision by reopening this request.

BTW same happen in epel8 ATM

and on epel9