3DML stands for 3-Dimensional Markup Language. Where HTML describes a web page, 3DML describes 3D spots. In order to view these spots, you first must download Flatland Rover plugin.
My spots, blockbuilding notes, and scripting notes will all be at xuriel.com, along with all of my D&D stuff. See you there. :)
p.s., All of my blocksets will be staying at spots.flatland.com/xuriel/blocksets/, in case you are already using them in your spots.