Can someone explain AI path node types for blocks?

To the best of my understanding:

• 'Default' means entities will treat it as a default 16*16 solid block.
• 'Open' means entities will treat it as air. (Like plants and stuff.) 
• 'Danger' means that entities will try to avoid it, (this doesn't always seem to work, though I sometimes just attribute it to minecraft mobs having stupid pathfinding.)
• ...And the rest are a mystery to me. There really isn't a good source on these, which might explain why Minecraft pathfinding is so bug ridden...