III.B. File Encoding Metadata (Repeatable for each file)
Identifies the encoding pertinent to the individual files that comprise the record.
Identifies the data encoding standards used by the file (i.e., ASCII, EBCDIC, or UNICODE character data, ASN.1, CCITT Group III raster, etc.)
III.B.3.Data-Codes [Mandatory if non-standard methods of representation are used]
Indicates specifically how the data is encoded when registered methods are not being used. For example, for vector data whether it is topological, spaghetti, chain-node, etc., for raster data the number of dots per inch and their bit density, for sampled data the number of samples per second, etc.
Identifies the method of compression, if any, that was used (ex: None, JPEG, MPEG, Quicktime, LZW, etc.). If the method complies to a specific standard, this may consist of only the identification of that standard (name, version, etc.), otherwise the method may need to be defined in technical detail.