How do I create XML from XSD programatically using C in a Unix environment

I've searched all over the web including this site but all the answers are related to C++, C# or an existing application. I've written an application in C that can generate XML but the XML is generated based on the elements of a known XSD. I'd like to be able to pass any XSD into the function, parse it, and generate the XML based on the XSD. I'm new to working with XML but not C.