julia.appdata.xml uses an ancient version of the AppStream specification

[cdluminate]

$ appstreamcli validate contrib/julia.appdata.xml 
E - julia.appdata.xml:~:3
    The metainfo file uses an ancient version of the AppStream specification, which 
    can not be validated. Please migrate it to version 0.6 (or higher).

Validation failed: errors: 1

The following patch is taken from Debian's package. It makes Debian's package checker happy, but I'm not sure whether it's correct.

Purpose: lintian error due to ancient version of metadata format
Reference: https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html
Created-by: Mo Zhou
Last-Update: 2018-07-04
Forwarded: not yet.

diff --git a/contrib/julia.appdata.xml b/contrib/julia.appdata.xml
index 576d883..e88a844 100644
--- a/contrib/julia.appdata.xml
+++ b/contrib/julia.appdata.xml
@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Copyright 2014 Paul Lange <[email protected]> -->
-<application>
- <id type="desktop">julia.desktop</id>
+<component>
+ <id>org.julialang.www</id>
+ <name>Julia</name>
  <metadata_license>CC-BY-SA-3.0</metadata_license>
  <project_license>MIT and LGPL-2.1+ and GPL-2.0+</project_license>
+ <summary>high-performance programming language for technical computing</summary>
  <description>
   <p>
    Julia is a high-level, high-performance dynamic programming language for
@@ -20,9 +22,6 @@
    external packages through Julia’s built-in package manager at a rapid pace.
   </p>
  </description>
- <screenshots>
-  <screenshot type="default">https://julialang.org/images/julia-gnome.png</screenshot>
- </screenshots>
  <url type="homepage">https://julialang.org/</url>
- <updatecontact>[email protected]</updatecontact>
-</application>
+ <update_contact>[email protected]</update_contact>
+</component>

[nalimilan]

Thanks. Would you open a pull request?

A few remarks:

• org.julialang.www should be org.julialang.julia
• the .desktop file should be moved to a ⁠<launchable> section
• the screenshorts should be kept (and we should update it, but it can be done at any time)
• I think there should be an upper case to "High-performance"
• finally, I think you can remove the update contact, as the address is no longer valid and there's no replacement (Discourse isn't an e-mail address).

[cdluminate]

@nalimilan Thanks for the comment. See #28020