Two kinds of composite services generally are recognized:
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Hardwired composite services
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Loosely wired composite services
Hardwired composite services are characterized by low flexibility, owing to pre-defined flow and control of services
where the flow and control is not externalized. These types of services have attractive Qualities of Service attributes
such as performance .
Loosely wired composite services are characterized by high flexibility. Services are composed into business
processes by externalizing flow and control. This type of composition exploits modeling tools to define the flows
and to "wire" services into them. Composition using BPEL is an example.
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