  In very-high-energy (VHE) gamma-ray astronomy, the community is converging
towards the use of a common open data format, called "Data formats for
Gamma-ray Astronomy", for the high-level data products. This format is in use
for ground-based TeV observatories like H.E.S.S., MAGIC or HAWC, some of whom
plan to openly release high-level data products. These efforts are parallel to
the development and use of open analysis software such as the Gammapy package.
This open initiative has shown that it is possible to define common standards
even without governance. With the advent of open VHE observatories (e.g. CTAO,
KM3NeT) and an increase in both multi-wavelength and multi-messenger studies,
such standards should evolve to support all of VHE multi-messenger
astrophysics. For these reasons, a new initiative has been created to specify
formats of high-level data from very and ultra high energy gamma-ray facilities
and from VHE neutrino detectors. It also aims to better respect the FAIR
principles and the IVOA recommendations.This communication will present the
Very-high-energy Open Data Format (VODF) project that has been established by
eleven VHE astroparticle facilities. Its structure, its organisation and its
goal will be presented. Anchored in Open Science, our goal is to solicit
comments and future contributions from the VHE astrophysics community.
