You can begin with an automatically generated component model, as described above, and then customize the component model by editing XML. You can edit a component model's XML by using the Advanced Edit feature on the component's Component > Details page. You can also edit the XML by downloading it to your local system and editing it with an XML-schema-validating editor, such as Turbo XML.
Editing XML enables you to:
Customize the component with additional variables
Add calls to extended control services, such as starting and stopping IIS or Windows services