[Gimp-docs] Linking to procedure id doesn't work

[Julien Hardelin <jhardlin orange fr>]

Hi,
I am writing doc for Image/Metadata.
I created links to plug-in-metadata-editor and  plug-in-metadata-viewer 
and got "Unknown ID" error message:

*** Validating XML (en) ... 
-:53888: element link: validity error : IDREF attribute linkend
references an 
unknown ID "plug-in-metadata-editor"
-:53882: element xref: validity error : IDREF attribute linkend
references an 
unknown ID "plug-in-metadata-viewer"

Here are XML code samples:

*** metadata.xml:

<sect3>
  <title>The Metadata Submenu</title>
  <para>
    GIMP uses two plug-ins:
    <itemizedlist>
      <listitem>
        <para>
          <!--<xref linkend="plug-in-metadata-viewer"/>-->
          <link linkend="plug-in-metadata-viewer">Metadata
Viewer</link>.
        </para>
      </listitem>
      <listitem>
        <para>
          <link linkend="plug-in-metadata-editor">Metadata
Editor</link>.
        </para>
      </listitem>
    </itemizedlist>
  </para>
</sect3>

-----------------------------------------------------------
*** metadata-viewer.xml:

<sect2 id="plug-in-metadata-viewer">
  <title>Metadata Viewer</title>

 <!--<anchor id="plug-in-metadata-viewer"/>-->
  <indexterm>
    <primary>Metadata</primary>
    <secondary>Metadata Viewer</secondary>
  </indexterm>
</sect2>

----------------------------------------------------------
*** metadata-editor.xml:

<sect2 id="plug-in-metadata-editor">
  <title>Metadata Viewer</title>

 <!--<anchor id="plug-in-metadata-editor"/>-->
  <indexterm>
    <primary>Metadata</primary>
    <secondary>Metadata Editor</secondary>
  </indexterm>
</sect2>


How to fix this error?

Julien