Dave,
What is the Class attribute? I have never heard of it before.
LPD Input will capture a file sent from an external source to an active LPD Queue. It captures the file "as is", without modifying it, and doesn't capture anything else.
Please provide more details about the Class attribute, so that we can determine whether or not there's a way to use it in PlanetPress Workflow.
Regards,
Rapha