XHTML The Basics A brief history of HTML SGML (Standard Generalized Markup Language) Then came HTML Followed by the browser…and the great browser wars. - ppt download
XHTML Tutorial - Tools for Viewing XHTML Documents
PPT - Mastering the Internet, XHTML, and JavaScript PowerPoint Presentation - ID:30266
Selecting a Tool for Creating Web Pages - HTML and XHTML Step by Step [Book]
Visual XHTML Editor
GitHub - jeffrafter/xhtml2fo: Tools for converting XHTML to XSL:FO