Clarify that logs attributes are a superset of standard attributes

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))
+- Clarify that logs attributes are a superset of common attributes.
+  ([#3852](https://github.com/open-telemetry/opentelemetry-specification/pull/3852))
 
 ### Resource
 

specification/logs/data-model.md

@@ -444,13 +444,15 @@ is optional.
 
 ### Field: `Attributes`
 
-Type: `map<string, any>`.
+Type: [`map<string, any>`](#type-mapstring-any).
 
 Description: Additional information about the specific event occurrence. Unlike
 the `Resource` field, which is fixed for a particular source, `Attributes` can
 vary for each occurrence of the event coming from the same source. Can contain
-information about the request context (other than TraceId/SpanId). SHOULD follow
-OpenTelemetry [semantic conventions for attributes](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/README.md).
+information about the request context (other than [Trace Context Fields](#trace-context-fields)).
+The log attribute model MUST support [`any` type](#type-any),
+distinct from [Common Attribute](../common/README.md#attribute) (a superset),
+to preserve the semantics of structured attributes emitted by the applications.
 This field is optional.
 
 #### Errors and Exceptions