<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.10 -->
  <object class="GtkWindow" id="aaa"/>
  <object class="GtkWindow" id="bbb"/>
  <object class="GtkWindow" id="ccc">
    <property name="transient_for">aaa</property>
  </object>
</interface>