There is documentation describing each papiNet e-Document. Definitions of all items in the papiNet standard are listed in a Data Dictionary.
Documentation can be downloaded from www.papinet.org -> The Standard -> Download Current Version -> V2R31 non-namespaced version -> Documentation link.
The User Groups have documented use cases and business rules as well as other helpful material.
User Group documentation can be downloaded from the User Group home pages on www.papinet.org.