Technical Documentation - XML Definitions

I have known about DocBook for quite some time as an XML schema to develop technical (or any) documentation. Recently I have stumbled over the DITA (Darwin Information Typing Architecture Article) standard, which is an alternative technical documentation definition. Unlike DocBook, DITA is not just for defining a single technical documents but more about the definition of topics that are later linked together. This creates for greater perceived flexibility, however I have not yet tried DITA so I can not comment in detail. For a good overview have a read through the Introduction to DITA article. I also found the FAQ found inside the DITA download to also help in my understanding.

Links
DocBook Website
Introduction to the Darwin Information Typing Architecture Article
Download DITA