I think the code in the GEDCOM file was generated by a genealoy program, probably Legacy. The way it’s organised is as follows.
In the header of the file there is a forward reference:
1 SUBM @[email protected]
Then towards the end of the file the record itself:
0 @[email protected] SUBM
1 NAME xxx
1 ADDR yyy
2 CONT zzz
(etc.)