{description: Value Set of codes that are used for base64 MIME encoding.  Base64 is defined as follows (adapted from MIME Internet standard RFC 1521)., package_name: hl7.terminology.r4, name: Hl7VSMimeBase64EncodingCharacters, type: null, package_version: 5.2.0, class: unknown, kind: null, url: 'http://terminology.hl7.org/ValueSet/v2-0290', version: 2.0.0}