developing schema for word 2007

Hello list,

I am new to this list and of course new to xml:schema and docx.

I want to develop a schema for MS Word 2007 to validate the content  
and the structure of a word template. I use the docx format as input.

My question is do I need to write a schema for every file inside the  
docx container or is it enough to write a schema just for the  
document.xml file?

Thanks a lot for the help,

Andreas