pkp/omp — comment on commit 2204e81c8a6980cfe52138abbe4f12601cccb07f
File: plugins/importexport/onix30/Onix30ExportDom.inc.php line 57
By asmecher:

You're going to end up embedding a lot of magic numbers for ONIX support. Consider a few approaches, used depending on the situation: XML-backed data sets (like we do for currencies); declared constants; and comments in the code including HREFs to the code lists. Whatever will be most efficient while still offering flexibility to users who might want to do some minor customization. I expect we'll have to flesh this out quite a bit in subsequent releases.

I'm also not sure about the IP requirements if we do distribute code lists in some form with OMP -- worth some up-front research.