I am looking for 2 pieces of information about building QR codes, but Google is failing me:

1. (Most important) Information about the different message formats; like MEBKM, SMSTO, TEL, GEO, WIFI, etc. i.e. Others not listed and how they are formatted (e.g. `"MEBKM:TITLE:{$title};URL:{$url};;"`).
2. How to build them. Wikipedia has a little info, but not enough. (Currently I am using Google, but I want a little more power)

Thanks!