| XHTML 1.1 - Module-based XHTML: The current W3C XHTML specification. Includes definitions and documentation for XHTML. |
| Building XHTML Modules: Working draft. Defines how XHTML modules can be built. |
| HLink: Module providing link recognition for the XHTML Family. |
| 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. |
| 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) |
| XHTML 1.0 (Second Edition) Specification: Official W3C specification for the markup language. |
| XHTML Basic: A W3C specification for a minimal subset of Modular XHTML. |