SIS administrators write a composition script for each combination of services that is appropriate for their network.

A composition script is a set of script statements that the SIS evaluates in the order they appear in the script.

Composition scripts may include the following statements:

  • invoke — to invoke a service

  • parallel — to invoke a number of services in parallel

  • if — to control whether a set of script statements should be executed based on a condition (branching)

  • assign — to assign values to variables

  • delete — to delete values from variables

  • halt — to halt a composition.

Tip Some statements may be nested. For example the body of an if statement may include other if statements.
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