        <li><strong><a href="http://www.w3.org/XML/Schema">W3C XML Schema (WXS)</a></strong> - an object-oriented XML schema
                    language. WXS also provides a type system for constraining the character data of an XML document.
                    WXS is maintained by the <a href="http://www.w3.org">World Wide Web Consortium (W3C)</a> and is a W3C
                    Recommendation (that is, a ratified W3C standard specification).</li>
                <li><strong><a href="http://www.relaxng.o