I agree with Louis. I do accept what arb is concerned about but, if I understand Louis correctly, I think you are missing the main point: main point is that if gedcom reader x doesn't recognise a chunk of data it should ignore it - pass on by and leave it intact.
For me this is a no-brainer. If I can't ...
Complete Genealogy Data Transfer - Blog comment by qbuster - 13 Jun 2015