Accessibility Guidelines 1.0 XHTML 1.0: The Extensible HyperText Markup Language HTML 4.01 Specification XSL Transformations (XSLT) Version 1.0 XML Path Language (XPath) Version 1.0 Associating Style Sheets with XML documents Web Content Accessibility Guidelines 1.0 Resource Description Framework (RDF) Model WebCGM Profile Namespaces in XML Document Object Model (DOM) Level 1 Synchronized Multimedia Integration Language (SMIL) 1.0 PICS Signed Labels (DSig) 1.0 Specification Cascading Style Sheets, level 2 (CSS2) Specification Extensible Markup Language (XML) 1.0 Specification PICSRules 1.1 Specification HTML 3.2 Reference Specification Cascading Style Sheets (CSS1) Level 1 Specification PICS 1.1 Rating Services and Rating Systems PICS 1.1 Label Distribution PNG (Portable Network Graphics) Specification Authoring Tool