TIGR’s text states that the TR and TD fields should be used for SCH and GFI, but it should be SCH and RES.
I.e., the following;
In SCH and GFI, the following attributes are added
In SCH and RES, the following attributes are added
cologic who wrote the extension confirm that this was indeed the intention. I don’t think anyone have implemented it for support in GFI, but rather RES. If someone indeed have done that (or can find a software that does so), please leave a comment.