VGML = Vegetarian Meal - Basically a Vegan meal, as near as I can tell, as it will not contain dairy or egg.
VLML = Vegetarian Meal that may contain dairy products and/or egg products.

So, you wouldn't get scrambled eggs in a VGML, but technically, they wouldn't be off-limits for a VLML.

Mind you, I don't know what the contents of either are, as I've always gone for AVML (and the coach AVML out of the US is extremely good, if anyone wants to know. The coach AVML out of NRT is OK, but not nearly as good as the one out of the US - go figure!) I was thinking of mixing things up and trying something different.