The Xend can read and write all of its configurations in a semi-structured form, also called “S-expression”. These expressions are either stand-alone, or have another expression as argument. For example, to define that a VM Guest has 2 CPUs available, the expression would look like:

(domain
  ...
  (vcpus 2)
  ...
) 

The following pages contain descriptions for most of the commonly used options for the Xend configuration. However, there is no guarantee for completeness.