Loading .ods template, inserting values, saving new file

[Stigu]

As part of a summer internship I'm making an automated test program.
I am to load a pre made .ods file, where all the needed calculations are done automatically. The program is supposed to access certain elements in the file, insert values, then save the document as a new file.
My questions are:
1. How to open a pre made .ods file in c++?
2. How to access an element?
3. How to save as a new .ods file?

Thanks

[eraggo]

Basically .ods (OpenDocument Sheet(?)) is a zipped file including many folders to describe current sheet(s), styles etc. You can open it with unzip in Linux (or with Windows own unzipper).
http://en.wikipedia.org/wiki/OpenDocument

After you unzip .ods you have many folders and files to work with... The real data (if you may) is a XML-file called "content.xml".