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XI Tracks 
You use an XI track (Exchange Infrastructure track) to transport design objects from various Integration Repositories or configuration objects from various Integration Directories.
The following development states exist for the development of XI objects:
· Development
· Consolidation
· Production
An Integration Repository or an Integration Directory exists for each of these states; each repository or directory runs on a separate J2EE instance.

The following figure shows an XI track as a schema:

For more
information about distributing XI content, see
Transporting Using the
Change Management Service.