Service classifi cation revisited
You have learned in the previous chapter that services can be divided into
elementary services, composite services, and process services:
• Elementary services: The smallest possible components that qualify as
services. For example, a service that can be used for zip code lookups.
• Composite services: Services that result from combining two or more other
services into one service that provides more value. Composite services are
executed in a single transaction and their execution time is relatively short.
An example is a service to book a hotel and fl ight together.
• Process services: Longer running services that can take a couple of hours,
days, or even more to complete and span multiple transactions. An example
is a service for ordering a book online. The entire process (order, pay, ship,
deliver) involves multiple transactions and takes a couple of hours at least.
Service classifi cation revisitedYou have learned in the previous chapter that services can be divided intoelementary services, composite services, and process services:• Elementary services: The smallest possible components that qualify asservices. For example, a service that can be used for zip code lookups.• Composite services: Services that result from combining two or more otherservices into one service that provides more value. Composite services areexecuted in a single transaction and their execution time is relatively short.An example is a service to book a hotel and fl ight together.• Process services: Longer running services that can take a couple of hours,days, or even more to complete and span multiple transactions. An exampleis a service for ordering a book online. The entire process (order, pay, ship,deliver) involves multiple transactions and takes a couple of hours at least.
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