A member of the BaseRecordLayout substitution group intended for use with archival formats of microdata held in an external file with fixed or delimited locations for data items. In addition to the link to the PhysicalStructure provided by BaseRecordLayout, the record layout is this namespace (p) identifies the character set and array base for the stored data, an optional reference to the default VariableScheme for the data items, a flag indicating that the variable names are provided on the first row of the data file, and a full description of each data item including a link to its description and its physical location in the record.