https://github.com/savastakan/dnmso#PSI-Mod-Ref
Property 'PSI-Mod-Ref; The identifier provided by PSI-Mod. '

DatatypeProperty

The PSI-Mod Ontology contains an abundance of modifications and any modification in an DNMSO instance should reference the proper PSI-Mod term.

Modification; PTM or general mass change.

PSI-Mod-Ref; The identifier provided by PSI-Mod.

string