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Elementary information descriptors can be composed into complex informa-
tion descriptors using constructions such as concatenation, conjunction, implica-
tion, disjunction and complement. These may refer to the fronts alone or both
fronts and tails of descriptors. For more details, see [10]. In this paper we will
use:

Figure 1 Elementary information descriptors can be composed into complex informa- tion descriptors using constructions such as concatenation, conjunction, implica- tion, disjunction and complement. These may refer to the fronts alone or both fronts and tails of descriptors. For more details, see [10]. In this paper we will use: