A lot of SIVI documentation, related to SIVI AFS, is available on the SIVI website. Most of this information is written in Dutch. The goal of SIVI is to add an English translation of this documentation to the SIVI AFS Manual.
You can find some useful links to SIVI documentation in the Support chapter.
Please do not hesitate to contact firstname.lastname@example.org, if you have any questions about standards that are not included in the SIVI AFS documentation, yet.