This
modeling process is straightforward and requires prior knowledge of the participating domains,
their interrelationships, and their management control structure. The next few sections further
discuss how to align services with these business layers.
PARTITIONED DOMAIN LEVELS. Recall that two or more domains that make up a single level
in a layered structure are referred to as a partitioned domain level. This method is pursued when
domain layers share the same granularity level in terms of their responsibilities, functionality,
detail of business implementation, and management authority. Exhibit 11.6 illustrates this idea:
The base domain D1.L1 supports a partitioned domain level positioned on top that is made up of
three business domains: D2.L2, D3.L2, and D4.L2.
To formalize this presentation, construct a service-oriented business integration diagram
using the contained symbol to denote a partitioned level structure. Exhibit 11.7 depicts the contained
business domain layers that are equally leveled (D2.L2, D3.L2, and D4.L2), meaning these
three domains lie on top of the base layer D1.L1 and are regarded as level 2 in the overall layered
construction.
SWAPPING DOMAIN LAYERS. Another layered domain example that introduces the use of both
the contained and the separated icons is depicted in Exhibit 11.8. A close look at these illustrated
D1.L1
D2.L2 D3.L2
D4.L2
EXHIBIT 11.
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