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Whenever the eLandings developers need to add a data element they modify the XML schema. They also increment the schema version number, and modify the eLandings codebase to add forward and backward compatibility logic to handle differences in documents made with different versions of the schema. In many cases end users and interfacing systems may not be affected by the new or changed XML elements.

Versioning Stability for Interfacing Systems

Systems that interface with eLandings can generally continue to use an outdated schema if they do not use data elements contained in a newer schema. While the eLandings development team recommends that all interfacing systems keep up to date on schema versions, we recognize that it can be difficult or inconvenient to update interface code in a timely manner. The eLandings system supports the use of legacy versions of the schema. The system upgrade incoming data to the current version of the schema automatically.

XML Usage Documentation

The eLandings documentation on the Confluence website includes a system interface guide that describes the main XML documents, their elements, and how the elements are used.