stance-of', 'nth-domain', the 'function' class, the sequence selectors
'first', 'second', 'third', 'last', the sequence constructors 'pair',
'triple', and the sequence classes 'Pair' and 'Triple'.

Structural:

This component provides the structural aspect of the SUO. There may be
several approaches to this. Currently I am working on a building blocks
approach to ontological structure -- a rather elaborate categorical approach
that uses some insight from Barwise's theory of distributed logic called
Informat