Open XML support in Pages It looks like iWork's Pages supports Open XML - however, I can't find any good information on this on either developer.apple.com or on the web. Is there a good resource for this that I'm not aware of? I see http://openxmldeveloper.org but this is clearly MS-specific. Is there a comparable resource for Pages?

I'd like a trivial example of how this would work such as a "Hello World" type document. Does this exist?
Office Open XML is a standard invented by Microsoft - their documentation would be the go-to resource. Pages simply uses the built-in OS X ability to read them. TextEdit can read OOXML (i.e. .docx) as well, and is included (with source) with Apple's developer tools as a sample.