validation

spec/Section 5 -- Validation.md

@@ -593,14 +593,14 @@ fragment conflictingDifferingResponses on Pet {
   - Let {requiredStatus} be the required status of {field}
   - Let {designatorDepth} be the number of square bracket pairs in {requiredStatus}
   - Let {typeDepth} be the number of list dimensions in {fieldType}
-  - If {typeDepth} equals {designatorDepth} return true
+  - If {typeDepth} equals {designatorDepth} or {designatorDepth} equals 0 return true
   - Otherwise return false
 
 **Explanatory Text**
 
 List fields can be marked with nullability designators that look like `[?]!` to indicate the 
 nullability of the list's elements and the nullability of the list itself. For multi-dimensional
-lists, the designator would look something like `[[[!]?]]!`. The number of dimensions of the 
+lists, the designator would look something like `[[[!]?]]!`. If the designator is not a simple `!` or `?`, then the number of dimensions of the 
 designator are required to match the number of dimensions of the field's type. If the two do not 
 match then a validation error is thrown.