TopDl: two.xml

<experiment>
 <version>1.0</version>

 <!-- Substrate that links the two computers -->
 <substrates>
  <name>link0</name>
 </substrates>


 <!-- A computer element named a with an interface on the link0 substrate -->
 <elements>
  <computer>
   <name>a</name>
   <interface>
    <substrate>link0</substrate>
    <name>inf000</name>
   </interface>
  </computer>
 </elements>

 <!-- A computer element named b with an interface on the link0 substrate -->
 <elements>
  <computer>
   <name>b</name>
   <interface>
    <substrate>link0</substrate>
    <name>inf000</name>
   </interface>
  </computer>
 </elements>
</experiment>