Add rationale: "This element allows capturing signatures on documents. ?It also allows?signatures on messages, transactions or even query responses. ?It may support content-authentication, non-repudiation or other business cases.? This is primarily relevant where the bundle may travel through multiple hops or via other mechanisms where HTTPS non-repudiation is insufficient." Add usage note: "The signature could be created by the "author" of the bundle or by the originating device. ?Requirements around inclusion of a signature, verification of signatures and treatment of signed/non-signed bundles is implementation-environment specific" Revise the data type from base64Binary to Signature