Is there a good definition of the GAF format used by the program vg ?
Is this actually GFA format, as perhaps alluded to in this blogpost (not clear) ? https://ekg.github.io/2019/07/09/Untangling-graphical-pangenomics
I would strongly suggest avoiding creating a rival GAF format in bioinformatics, since if you google it you'll find GO annotation file format (see below).
GO Annotation File (GAF) format - Gene Ontology