[LyX/master] Update metainfo to newer format.

[Pavel Sanda]

commit 837791c5ef4daab5b3244c4afbd9adf0dbbfb5a2
Author: Pavel Sanda <sanda at lyx.org>
Date:   Sun Jul 11 04:15:55 2021 +0200

    Update metainfo to newer format.
    
    Used appstream form:
    https://www.freedesktop.org/software/appstream/metainfocreator/#/guiapp
---
 lib/appdata.xml              |   35 -----------------------------------
 lib/org.lyx.LyX.metainfo.xml |   30 ++++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 35 deletions(-)

diff --git a/lib/appdata.xml b/lib/appdata.xml
deleted file mode 100644
index 26d29e4..0000000
--- a/lib/appdata.xml
+++ /dev/null
@@ -1,35 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<application>
-  <id type="desktop">lyx.desktop</id>
-  <licence>GPL-2.0+</licence>
-  <name>LyX</name>
-  <summary>The Document Processor</summary>
-  <description>
-    <p>LyX is a document processor that encourages an approach to
-    writing based on the structure of your documents (WYSIWYM) and
-    not simply their appearance (WYSIWYG).</p>
-    <p>LyX combines the power and flexibility of TeX/LaTeX with the
-    ease of use of a graphical interface. This results in
-    world-class support for creation of mathematical content (via a
-    fully integrated equation editor) and structured documents like
-    academic articles, theses, and books. In addition, staples of
-    scientific authoring such as reference list and index creation
-    come standard. But you can also use LyX to create a letter or a
-    novel or a theatre play or film script. A broad array of ready,
-    well-designed document layouts are built in.</p>
-    <p>LyX is for people who want their writing to look great,
-    right out of the box. No more endless tinkering with formatting
-    details, “finger painting” font attributes or futzing around
-    with page boundaries. You just write. On screen, LyX looks like
-    any word processor; its printed output — or richly
-    cross-referenced PDF, just as readily produced — looks like
-    nothing else.</p>
-  </description>
-  <screenshots>
-    <screenshot type="default" width="1000" height="814">http://www.lyx.org/images/about/main_window.png</screenshot>
-    <screenshot width="623" height="431">http://www.lyx.org/images/about/preview_dvi.png</screenshot>
-    <screenshot width="962" height="720">http://www.lyx.org/images/about/edit_menu.png</screenshot>
-  </screenshots>
-  <url type="homepage">http://www.lyx.org</url>
-  <updatecontact>lyx-devel at lists.lyx.org</updatecontact>
-</application>
diff --git a/lib/org.lyx.LyX.metainfo.xml b/lib/org.lyx.LyX.metainfo.xml
new file mode 100644
index 0000000..2c03194
--- /dev/null
+++ b/lib/org.lyx.LyX.metainfo.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>org.lyx.LyX</id>
+  
+  <name>LyX</name>
+  <summary>The Document Processor</summary>
+  
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0-or-later</project_license>
+  
+  <description>
+    <p>
+      LyX is a document processor that encourages an approach to writing based on the structure of your documents (WYSIWYM) and not simply their appearance (WYSIWYG).
+    </p>
+    <p>
+      LyX combines the power and flexibility of TeX/LaTeX with the ease of use of a graphical interface. This results in world-class support for creation of mathematical content (via a fully integrated equation editor) and structured documents like academigned document layouts are built n addition, staples of scientific authoring such as reference list and index creation come standard. But you can also use LyX to create a letter or a novel or a theatre play or film script. A broad array of ready, well-designed document layouts are built in.
+    </p>
+    <p>
+      LyX is for people who want their writing to look great, right out of the box. No more endless tinkering with formatting details, finger painting font attributes or futzing around with page boundaries. You just write. On screen, LyX looks like any word processor; its printed output - or richly cross-referenced PDF, just as readily produced - looks like nothing else.
+    </p>
+  </description>
+  
+  <launchable type="desktop-id">lyx.desktop</launchable>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://www.lyx.org/images/lyx_xmlinfo_screenshot.png</image>
+    </screenshot>
+  </screenshots>
+  <update_contact>lyx-devel_AT_lists.lyx.org</update_contact>
+</component>