[Part 3](http://schemekeys.blogspot.com/2007/01/going-further-with-primitives.html)
[Part 4](http://schemekeys.blogspot.com/2007/01/odd-and-ends.html)
[Part 3](http://schemekeys.blogspot.com/2007/01/going-further-with-primitives.html)
[Part 4](http://schemekeys.blogspot.com/2007/01/odd-and-ends.html)