These two alternatives show that there are in general two different concepts
concerning the chaining of services: „Centralized Service Chaining“ and „Cascading
Chaining“ according to R. Lucchi [personal communication, May 07, 2007].
Centralized Service Chaining means that a single central service invokes all other
services, one after the other and controls the entire work flow. This approach is stateof-the-art and supported by common technologies. On the other hand, the Cascading
Chaining method exchanges data directly because the individual services
communicate with each other. Both concepts are presented in figure 4 and figure 5.