Generates SQL from Perl datastructures. This is a subclass of the
SQL::Abstract manpage, fully compatible with the parent class, but it
handles a few additional SQL constructs, and provides a different API with
named parameters instead of positional parameters, so that various SQL
fragments are more easily identified.

This module was designed for the specific needs of the DBIx::DataModel
manpage, but is published as a standalone distribution, because it may
possibly be useful for other needs.

This software is not yet fully stable; future versions may introduce some
minor differences in the calling interface.