The basic objects
in Noos are terms that can be
distinguished in four categories: feature terms, strings, numbers, and
symbols. All the terms are also values of Noos--i. e. there is
no type/value class/instance distinction. We will not say much about
strings, numbers, and symbols--in the current implementation of Noos they
are just like Lisp strings, numbers, and symbols. However, this should not
be conceived as the capability of using Lisp functions dealing with
strings, numbers, and symbols. This is not the case, basic arithmetic
operations, for instance, are provided by Noos. Information about strings,
numbers, and symbols can be found on Appendix A. The
next section introduces descriptions, the basic object in Noos,
that later is expanded in Chapter 3. The notions and
terminology conspicuous to Noos will be introduced gently in this chapter
but they all can be found in the Glossary (Appendix B,
page 
).