Hentzenwerke Intergalactic also points out Q and A on Microsoft’s XML-schema license: Gary Edwards on OpenOffice.org forum.
The decision by Microsoft to restrict the schema to their OfficeXP products XML within licensing and patent protection means that developers once again find themselves in legal trouble just trying to do their jobs. Can I use a third-party tool to manipulate the XML? To display it? To print it? To transform it into something else?
Here’s what the current Microsoft license looks like:
http://www.microsoft.com/mscorp/ip/format/xmlpatentlicense.asp