1<interface>
2  <object class="GtkLabel" id="bla"/>
3  <object class="GtkDropDown">
4    <property name="expression">
5      <closure type='gchararray' function="strcmp">
6        <constant type="gchararray">File size:</constant>
7        <lookup type="GtkLabel" name="max-width-chars">bla</lookup>
8      </closure>
9    </property>
10  </object>
11</interface>
12