I was looking for the same thing today, and Rod Jamieson was kind enough to send me a UDL file which he created many years ago. I've attached it here, although with some minor modifications. One is that I am used to starting comments with '::' (without the quotes), which is quicker to write than REM and is also less messy in the layout. Therefore I added this token to the comment section. Anyway, hope this works for you too.