[LINK] Microsoft patent...

[Bernard Robertson-Dunn]

.... for a word-processing document stored in a single XML file that may 
be manipulated by applications that understand XML
http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=7,571,169

Abstract
A word processor including a native XML file format is provided. The 
well formed XML file fully represents the word-processor document, and 
fully supports 100% of word-processor's rich formatting. There are no 
feature losses when saving the word-processor documents as XML. A 
published XSD file defines all the rules behind the word-processor's XML 
file format. Hints may be provided within the XML associated files 
providing applications that understand XML a shortcut to understanding 
some of the features provided by the word-processor. The word-processing 
document is stored in a single XML file. Additionally, manipulation of 
word-processing documents may be done on computing devices that do not 
include the word-processor itself.

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Regards
brd

Bernard Robertson-Dunn
Canberra Australia
brd at iimetro.com.au