Support of ITS tags in docbooks?

Hello,

I would like to include some ruby characters in my docbook.
https://en.wikipedia.org/wiki/Ruby_character

The ITS (Internationalization Tag Set) makes it possible to include ruby characters in docbooks.

This page contains a sample docbook with some ruby characters:
https://lists.oasis-open.org/archives/docbook-apps/201201/msg00042.html

I paste it here for your convenience:
<book xmlns="http://docbook.org/ns/docbook" xmlns:its="http://www.w3.org/2005/11/its" version="5.0">
 <title>...</title>
 <chapter>
  <title>...</title>
  <para>この本は <its:ruby>
    <its:rb>慶応義塾大学</its:rb>
    <its:rp>(</its:rp>
    <its:rt>けいおうぎじゅくだいがく</its:rt>
    <its:rp>)</its:rp>
   </its:ruby>の歴史を説明するものです。</para>
 </chapter>
</book>

When I open this docbook in XML Editor Personal Edition 10.2.0, I get this error:
 element "ruby" from namespace "https:www.w3.org/2005/11/its" not allowed in this context

- Is there anything wrong in the sample file?
- Could you send me a sample docbook file with ruby characters inside that works fine in XML Editor?

Best Regards
Stephane Aubry
PS: You can reply in French or Japanese if it’s more convenient for you.



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