A character string (letters, figures or symbols) that for brevity and/or language independence may be used to represent or replace a definitive value or text of an Attribute together with relevant supplementary information. A unique reference given to identify a particular request, order or instruction in the system of the organisation allocating it with the ability to associate the name of the Company that has allocated it. Must be the full filename including the extension(Reference IETF RFC 2045, 2046, 2047) The format of the binary content.Note: A file format is a particular way to encode information for storage in a computer file. May be identified by the section of its name following the final period, e.g., gif, pdf, jpg. Correspondence This value is used to signify a result as being Correspondence