@BenWiederhake
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How to reproduce: Use the example file for addons and remove zero-width spaces at the start of each line (snafu of a different project), yielding:

<?xml version="1.0" encoding="UTF-8"?>
<component type="addon">
  <id>gedit-code-assistance</id>
  <extends>gedit.desktop</extends>
  <name>Code Assistance</name>
  <summary>Code assistance for C, C++ and Objective-C</summary>
  <url type="homepage">http://projects.gnome.org/gedit</url>
  <metadata_license>CC0-1.0</metadata_license>
  <project_license>GPL-3.0+</project_license>
</component>

Then, try to validate the file.

Expected behavior: reference implementation validator and example in documentation agree on what is considered "correct", and the file passes validation.

Actual behavior (where ./appstreamcli is freshly built from master):

$ appstreamcli --version
AppStream-CLI-Werkzeugversion: 0.9.0
$ appstreamcli validate /tmp/as.xml 
Validierung fehlgeschlagen.
$ ./appstreamcli --version
AppStream-CLI-Werkzeugversion: 0.9.2
$ ./appstreamcli validate /tmp/as.xml 
E - as.xml:gedit-code-assistance
    The component is missing a long description. Components of this type must have a long description.

Validierung fehlgeschlagen.

So, who is right? The documentation clearly doesn't mention description as required:

For a component of type addon, the following tags are required and must be present: <id/>, <name/>, <summary/>, <metadata_license/>, <extends/>.

EDIT: This isn't add-on specific. The "example for a very basic component" doesn't have a description, either.

EDIT 2: Tested 0.9.1 on a different system

$ appstreamcli --version
AppStream-CLI-Werkzeugversion: 0.9.1
$ appstreamcli validate --pedantic telegram-purple.metainfo.xml 
Validierung fehlgeschlagen.