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# summarizes key features of the software,
# is a bit of a primer, describing basic attributes of a NetWeaver knowledgebase, and
# provides references that document at least some of the NetWeaver applications developed since the late 1980s.
First, though, a word about knowledgebases. While there are various ways of describing a [[knowledgebase]], perhaps one of the more central concepts is that a knowledgebase provides a formal specification for interpreting information.<ref>Walters, J.R., and N.R. Nielsen. 1988. Crafting Knowledge-based Systems. New York: John Wiley and Sons. 342 p.</ref> Formal in this context means that the specification is ontologically committed <ref> Gruber, T.R. 1995. Toward principles for the design of ontologies used for knowledge sharing. International Journal of Human-Computer Studies 43:907-928.</ref> to the semantics and syntax prescribed by a knowledgebase processor (aka, an engine).
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=== Truth values ===
The truth value is the basic state variable of networks and data links. It expresses an observation's degree of membership in a set. Evaluations of degree of set membership are quantified in the semantics of [[fuzzy logic
Data links are frequently used to read a datum and evaluate its degree of membership in a concept that is quantified in a fuzzy argument (an argument that quantifies fuzzy set membership). Thus, in a data link the argument is a mathematical statement of a proposition. Some simple examples include:
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