: vocabhttp://www.w3.org/1999/xhtml/ Create a prefix for http://www.w3.org/1999/xhtml/ Hit Enter to save Double click to create a prefix | xhv:stylesheet | : base.csshttp://www.w3.org/StyleSheets/TR/ Create a prefix for http://www.w3.org/StyleSheets/TR/ Hit Enter to save Double click to create a prefix |