From XML.com: "At the Open Source conference in Monterey last year, Sun announced their plans to release the current source code for Star Office,
renamed OpenOffice. In October they followed up on their plans, releasing both the source code and binaries for OpenOffice build 605.
One of the features added since Star Office 5.2 was the ability to save files as XML."
In addition to being open source, saving as XML makes OpenOffice truly open. Aside from being open source, XML's
self-documenting nature allows us to dive into the document format without having to dive into C++. And more significantly, XML
allows us to use simple, free tools to manipulate the documents themselves."