NOTE:
Changes have been made to the ITIS database schema. You may encounter differences from previous exports as a result of the Informix dbexport generation.


As of June 2004, the ITIS database schema has changed as follows:

The primary key for the vernaculars table has been replaced with a system generated key, vern_id. The vern_ref_links table has been modified to remove vernacular_name and language. The primary key for vern_ref_links has been replaced with the concatenation of tsn, vern_id, doc_id_prefix, and documentation_id.



As of June 2003, the ITIS database schema has changed as follows:

A new intersection table has been added, vern_ref_links to facilitate a M:M relationship between vernaculars and the three reference tables (experts, publications, and other_sources). The table definition can be found in the itis.sql file. The table is not yet fully implemented across the system. Vernacular data located in the reference_links table will be migrated solely to the vern_ref_links table in the near future.
The primary key for the vernaculars table is now the concatenation of tsn, vernacular_name and language. This will now support the existence of "duplicate" common names in different languages for the same scientific name.


 
As of April 2003, the ITIS database schema and/or data element definitions have been changed as follows: 

The length of data element, unaccept_reason (unacceptability_reason), has been increased to 50. The unacceptability reasons defined in the ITIS Submittal Guidelines are now fully implemented. 
The length of data element, origin, has been increased to 50. New origin values, Native and Extirpated, and Native and Extinct, are now included in the definition. 
The data element, uncertain_prnt_ind (uncertain_parent_indicator), has been added to the taxonomic_units table. This element is defined as char(3) and is optional. It improves the ability to identify taxa whose positions in the hierarchy are uncertain. 

