PML Support
Premus tries to support as much as it can of Vodafone's PartnerML, but will obviously always miss out on a few things such as billing (I really wish I could support that 
)
PML version
The latest version of the PML spec that I've seen is version 1.13.5. If you have a later version and find that something is missing from Premus, please let me know and send a newer spec.
Unsupported markup
Currently known unsupported markup includes:
- background pattern and border on table
- gallery
- color
- align
- background-color
- embedded sound
Validation
Premus doesn't validate XML Schema yet, and therefore doesn't warn if your PML is not valid. It only tries to render your PML as well as possible. XML Schema validation is however planned for the future.