-required that each enumeration mapping appears as variant type tag field.
-However, it is required that any enumeration mapping encountered within a
-stream has a matching variant type tag field.
+required that each enumeration mapping appears as variant type tag
+field. It is also not required that each variant type tag appears as
+enumeration mapping. However, it is required that any enumeration
+mapping encountered within a stream has a matching variant type tag
+field.