In their recent versions, the three major Free Software word
processing programs have all adopted XML formats as their native
document format. The approach to XML taken by AbiWord, KOffice's
KWord, and OpenOffice.org Writer differs somewhat between the
applications-- largely reflecting the underlying development focus
of each project. But all open source word processor developers have
realized the advantages of XML as a document format:
componentization of parsers and writers; openness and formality of
format specification; applicability of XSLT and other transformation
APIs.