This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
XML Schemas and XML-based documents are simple text files. To view them in a HTML browser, you would enter the file location in the browser's address textbox. Many commercial HTML-browsers include an XML parser and will parse an XML file if it recognizes it as such.
Your browser may not recognize an XML Schema's "XSD" file extension however.