Required VE Principles Any publicly registered web service can be consumed:

• by anyone, without requiring any change to the service
  (the Democratic Principle ) ; and
• anytime, without prior arrangement
  (the Just-in-Time Principle)

And as a corollary, robustness is achieved by

• runtime choice among competing services
  (the Free Market Principle) and
• the ability to construct automatically
  new processes to achieve goals
  (the Flexibility Principle).

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cjp