[XXE] Usage of colon in an xml:id

[Albert]

Dear Sir,

When I use the attached xml file in xmlmind I get the warning:
[2] <1> bad value for attribute "id" from namespace "
http://www.w3.org/XML/1998/namespace";
[3] <2> bad value for attribute "linkend"

The problem looks like to be the ':' in the xml:id. I searched the internet
and also some things on stackoverflow(
https://stackoverflow.com/questions/1077084/what-characters-are-allowed-in-dom-ids),
but from this I didn't see any restriction in using a ':' in an xml:id.

Did I miss something or it this an omission in xmlmind?

Best Regards,

Albert

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<?xml version='1.0' encoding='UTF-8' standalone='no'?>
<book xmlns="http://docbook.org/ns/docbook"; version="5.0" xmlns:xlink="http://www.w3.org/1999/xlink"; xml:id="_index">
  <info>
    <title>My Project</title>
  </info>
  <chapter>
    <title>Bibliography</title>
    <section xmlns="http://docbook.org/ns/docbook"; version="5.0" xmlns:xlink="http://www.w3.org/1999/xlink"; xml:id="_citelist">
      <para>
        <variablelist>
          <varlistentry><term><anchor xml:id="_citelist_1CITEREF_cgal:eb-19a"/>[1]</term>
            <listitem>
              <para>The CGAL Project. <link xlink:href="https://doc.cgal.org/4.14/Manual/packages.html";><emphasis>CGAL User and Reference Manual</emphasis></link>. CGAL Editorial Board, 4.14 edition, 2019.</para>
            </listitem>
          </varlistentry>
        </variablelist>
      </para>
    </section>
  </chapter>
  <chapter>
    <title>File Documentation</title>
    <section xmlns="http://docbook.org/ns/docbook"; version="5.0" xmlns:xlink="http://www.w3.org/1999/xlink"; xml:id="_aa_8h">
      <title>aa.h File Reference</title>
      <indexterm><primary>aa.h</primary></indexterm>
      <section>
        <title>Detailed Description</title>
        <para>a reference with a colon: <link linkend="_citelist_1CITEREF_cgal:eb-19a">[1]</link> </para>
      </section>
    </section>
  </chapter>
<index/>
</book>

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