[ERT.RelationType]
# In ISDB Event Relation Table (ERT)
Bits = 4
0 = Reserved
1 = Relation for the contents description (indicates tree structure to describe contents)
2 = Relation for navigation (indicates tree structure to assist display and selection)

[ERT.CollectionMode]
# In ISDB Event Relation Table (ERT)
Bits = 4
0 = Group (bag)
1 = Concatenation (sequential)
2 = Selection (alternate)
3 = Parallel
