...
  <slaves>
    <slave>
      <name>a</name>
      <description></description>
      <remoteFS></remoteFS>
      <numExecutors>1</numExecutors>
      <mode>NORMAL</mode>
      <retentionStrategy class="hudson.slaves.RetentionStrategy$Always"/>
      <launcher class="hudson.plugins.sshslaves.SSHLauncher">
        <host>a</host>
        <port>22</port>
        <username>a</username>
        <password>iamnotciphered</password>
        <privatekey></privatekey>
        <jvmOptions></jvmOptions>
      </launcher>
      <label></label>
      <nodeProperties/>
    </slave>
  </slaves>
...