List of ConfigurationItems
An XML<list> element wrapping zero or more ConfigurationItems.
Example
<list>
  <udm.Application id="Applications/AnimalZoo-ear">
    <deploymentPipeline>
      <ci ref="Environments/0newEnv0"/>
      <ci ref="Environments/0largeEnv0"/>
    </deploymentPipeline>
  </udm.Application>
  <udm.Application id="Applications/SampleDar">
    <deploymentPipeline/>
  </udm.Application>
</list>
