Add support for empty values in Logs Data Model

CHANGELOG.md

@@ -17,6 +17,8 @@ release.
 
 - Fix `Resource` field type in Logs Data Model.
   ([#3826](https://github.com/open-telemetry/opentelemetry-specification/pull/3826))
+- Define handling of empty keys and values.
+  ([#3853](https://github.com/open-telemetry/opentelemetry-specification/pull/3853))
 
 ### Resource
 

specification/logs/data-model.md

@@ -112,13 +112,15 @@ Value of type `any` can be one of the following:
 
 - An array (a list) of `any` values,
 
-- A `map<string, any>`.
+- A `map<string, any>`,
+
+- An empty value (e.g. `null`).
 
 #### Type `map<string, any>`
 
 Value of type `map<string, any>` is a map of string keys to `any` values. The
-keys in the map are unique (duplicate keys are not allowed). The representation
-of the map is language-dependent.
+keys in the map are non-`null`, non-empty, unique (duplicate keys are not allowed).
+The representation of the map is language-dependent.
 
 Arbitrary deep nesting of values for arrays and maps is allowed (essentially
 allows to represent an equivalent of a JSON object).