.XSS File Extension
File TypeXML Style Sheet
What is an XSS file?
Style sheet file created in UIX Styles' XML Style Sheet (XSS) language, which is based on the CSS standard, except that styles are specified in an XML format; contains layout properties for a document; used for defining the appearance of Web application pages.
XSS files are used by Oracles UIX (User Interface XML) technologies, which provide a framework for developing Web applications.