Example of an RSpec advertisement with a simple topology.

Advertisements also describe the topology among nodes. Here is a simple example with two nodes and a switch between them:

<?xml version="1.0" encoding="UTF-8"?>
<rspec xmlns="http://www.protogeni.net/resources/rspec/0.1"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.protogeni.net/resources/rspec/0.1 http://www.protogeni.net/resources/rspec/0.1/ad.xsd"
       type="advertisement"
       generated="2009-07-21T19:19:06Z" valid_until="2009-07-21T19:19:06Z" >
  <node component_manager_uuid="urn:publicid:IDN+emulab.geni.emulab.net+authority+cm"
        component_name="cisco3"
        component_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+cisco3" >
    <node_type 
      type_name="switch"
      type_slots="1"
    />
    <available>true</available>
    <exclusive>true</exclusive>
    <interface component_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+cisco3:(null)"/>
  </node>
  <node component_manager_uuid="urn:publicid:IDN+emulab.geni.emulab.net+authority+cm"
        component_name="pc119"
        component_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+pc119" >
    <node_type 
      type_name="pc850"
      type_slots="1"
    />
    <node_type 
      type_name="pc"
      type_slots="1"
    />
    <node_type 
      type_name="delay"
      type_slots="1"
    />
    <node_type 
      type_name="pcvm"
      type_slots="20"
    />
    <available>true</available>
    <exclusive>true</exclusive>
    <interface component_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc119:eth0"/>
    <interface component_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc119:eth2"/>
  </node>
  <node component_manager_uuid="urn:publicid:IDN+emulab.geni.emulab.net+authority+cm"
        component_name="pc111"
        component_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+pc111" >
    <node_type 
      type_name="pc850"
      type_slots="1"
    />
    <node_type 
      type_name="pc"
      type_slots="1"
    />
    <node_type 
      type_name="delay"
      type_slots="1"
    />
    <node_type 
      type_name="pcvm"
      type_slots="20"
    />
    <available>true</available>
    <exclusive>true</exclusive>
    <interface component_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc111:eth0"/>
    <interface component_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc111:eth2"/>
  </node>

  <link component_manager_uuid="urn:publicid:IDN+emulab.geni.emulab.net+authority+sa"
        component_name="link-pc111:eth0-cisco3:(null)"
        component_uuid="urn:publicid:IDN+emulab.geni.emulab.net+link+link-pc111%3Aeth0-cisco3%3A(null)" >
    <interface_ref component_node_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+pc111"
                   component_interface_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc111:eth0"/>
    <interface_ref component_node_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+cisco3"
                   component_interface_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+cisco3:(null)"/>
    <bandwidth>100000</bandwidth>
    <latency>0</latency>
    <packet_loss>0</packet_loss>
    <link_type type_name="ethernet" />
  </link>
  <link component_manager_uuid="urn:publicid:IDN+emulab.geni.emulab.net+authority+sa"
        component_name="link-pc119:eth0-cisco3:(null)"
        component_uuid="urn:publicid:IDN+emulab.geni.emulab.net+link+link-pc119%3Aeth0-cisco3%3A(null)" >
    <interface_ref component_node_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+pc119"
                   component_interface_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+pc119:eth0"/>
    <interface_ref component_node_uuid="urn:publicid:IDN+emulab.geni.emulab.net+node+cisco3"
                   component_interface_id="urn:publicid:IDN+emulab.geni.emulab.net+interface+cisco3:(null)"/>
    <bandwidth>100000</bandwidth>
    <latency>0</latency>
    <packet_loss>0</packet_loss>
    <link_type type_name="ethernet" />
  </link>
</rspec>