===================================================================
@@ -1022,7 +1022,7 @@
<para>
Complete details on Docbook markup can be found in the
- <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://tdg.docbook.org/tdg/5.0/ref-elements.html">DocBook Element Reference</link>.
+ <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://tdg.docbook.org/tdg/5.0/ref-elements.html">DocBook Element Reference</link>.
An incomplete reference for HTML to Docbook conversion is
detailed in the table below.
</para>