XHTML 1.0 (Second Edition) Specification - Official W3C specification for the markup language. Building XHTML Modules - Working draft. Defines how XHTML modules can be built. XHTML Basic - A W3C specification for a minimal subset of Modular XHTML. XHTML 1.1 - Module-based XHTML - The current W3C XHTML specification. Includes definitions and documentation for XHTML. Ruby Annotation - "Ruby" are short runs of text alongside the base text, typically used in East Asian documents to indicate pronunciation or to provide a short annotation. This specification defines markup for ruby, in the form of an XHTML module. (W3C Recommendation 31 May 2001) Modularization of XHTML in XML Schema - A methodology for the modularization of XHTML using XML Schema. It allows document authors to modify and extend XHTML in a conformant way. HLink - Module providing link recognition for the XHTML Family.