Queries described using the inference network query language appear to be
much more complicated than a simple text query with two or three words. Most
users will not understand this language, just as most relational database users do
not understand Structured Query Language (SQL). Instead, applications translate
simple user queries into more complex inference network versions. The more
complex query incorporates additional features and weights that reflect the best
combination of evidence for effective ranking. This point will become clearer as
we discuss examples in the next two sections.