For certain partners, it is obligatory if we could provide the BISAC Subjects instead of/in addition to our own themes.
First, we would add the BISAC subject codes/labels to Kappa v3; second we would map these two each IGO's own themes. Beginning with OECD's themes, because at the moment it's only requested for ONIX exports for OECD publications.
Thierry Guillebault has kindly provided a mapping he's already using. It is attached. We could extend this when/if necessary.