Figure 3 also illustrates the strong hierarchical orientation of most KMS databases (although KMS databases may have any structure that their creators desire). There is a multi-level hierarchy that acts as a "skeleton" for the whole database. The top levels of this skeleton serve primarily as an index to the entire database. The skeleton reaches down, at lower levels, to smaller hierarchies of frames that represent documents, project plans, and other task-related groups of information.
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