Appendix C. Interchanging DocBook Documents
One of the early factors that motivated the development of DocBook was the desire for companies to interchange documents. In particular, UNIX vendors wanted to be able to interchange common UNIX documentation.
A great deal of effort went into making sure that DocBook could handle most (probably all) of the documents that were likely to be exchanged. This avoids the guaranteed problem of interchanging documents created with extended schemas.
There are no unique interchange aspects to the Website customization.