Detailed Changes to DDI Codebook 2.5 - Data Documentation ...

This allows for a single description of a file structure when multiple data files share the same structure.After the first file's structure is described, the others can simply reference this description.Usage: Frequently a study or archive will contain a number of files all using the same content structurebut held in a number of files based on geographic coverage, year, case subset, etc. The addition of afileStrcRef to fileStrc allows the file structure to be declared a single time and then referenced by otherfiles using the same structure. This element in combination with the use of a fileCitation allows for acomplete listing of files using the same metadata and file structure.Example:2000SF1-040Census of Population and Housing: Summary File 1, 2000:Summary Level 040 (State)GDO-0001Physical Record 1 of 1715535212000SF1-050Census of Population and Housing: Summary File 1, 2000:Summary Level 050 (County)GDO-000231521