Update LogicalTypes.md

Co-authored-by: Antoine Pitrou <[email protected]>
apache · Nov 15, 2024 · d0a7212 · d0a7212
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@@ -681,6 +681,11 @@ optional group array_of_arrays (LIST) {
 
 #### Backward-compatibility rules
 
+Modern writers should always produce the 3-level LIST structure shown above.
+However, historically data files have been produced that use different structures to
+represent list-like data, and readers may include compatibility measures to interpret
+them as intended.
+
 ##### 3-level structure with different field names
 
 It is required that the repeated group of elements is named `list` and that