A typical configuration looks like this:
<screen><![CDATA[
<filter type="multi">
- <target route="route1">z3950.loc.gov:7090/voyager</target>
+ <target route="route1">lx2.loc.gov:210/LCDB</target>
<target route="route2">bagel.indexdata.dk/gils</target>
<target route="other">*</target>
</filter>