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Name Spaces and Name Architectures (Flat and Hierarchical)
(Page 2 of 3)
Hierarchical Name Architecture (Hierarchical or Structured Name Space)
In this architecture, while names
consist of a sequence of symbols, these symbols are assigned using a
specific and clear structure. The name consists of discrete elements
that are related to each other usually using hierarchical “parent/child”
semantics. There are many naming architectures in various contexts that
use this type of hierarchical structure; for example, consider how a
large company might set up an organization chart and name the executives
and officers in the organization. One hypothetical example of a hierarchical
name architecture is illustrated in Figure 233.
Figure 233: Hierarchical Name Architecture (Structured Name Space) This diagram contains the same devices as Figure 232, but they have been arranged using a hierarchical, structured name architecture. In this case, the organization has chosen to structure its device names first by facility location, and then by department. Each name starts with something like “USA-Service-” or “EU-Mfg-”. This provides immediate benefits by providing local control over device naming without risk of conflicts. If someone named John were hired into the USA sales force, his machine could be named “US-Sales-John” without conflicting with the machine owned by John of the European sales force (“EU-Sales-John”.) The structure also makes it easier to know immediately where a device can be found within the organization.
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The best-known real world
example of a hierarchical name space is the name
space of the TCP/IP Domain Name System,
which uses text labels separated by periods (“dots”) to form
an internal structure. All the names in the system are organized into
a structure, and a particular device's place in the structure can be
determined by looking at its name. For example, “www.tcpipguide.com”
refers to the World Wide Web server for The TCP/IP Guide, which is named
under the umbrella of “COMmercial” companies.
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