Hello,
I'm not sure  how to doing that. I must add some lines like this ?
  <object>
    <name>Main.SpaceIndex</name>
    <number>0</number>
    <className>XWiki.WikiMacroParameterClass</className>
    <guid>c041a13d-a9f3-4625-bce5-fb00d9e22387</guid>
    <class>
      <name>XWiki.WikiMacroParameterClass</name>
... cut ...
      <name>sort</name>
    </property>
  </object>
But which guid I must type?
Thxs