Often there will be a relationship of the following kind between two keys F and N. We present two alternative descriptions:

In light of the foregoing, we can describe a key as having up to three components.

It is important to realize that one key can be viewed in different ways at different levels of description. A key which at the kernel level is a start key to a node may be viewed as a start key to a domain, a start key to an OS domain or a Filedefdef key. This taxonomy speaks at the kernel level only.

Key Taxonomy