XHTML+RDFa 1.1 - Second Edition
RDFa Core 1.1 [RDFA-CORE] defines attributes and syntax for embedding semantic markup in Host Languages. This document defines one such Host Language. This language is a superset of XHTML 1.1 [XHTML11-2e], integrating the attributes as defined in RDFa Core 1.1. This document is intended for authors who want to create XHTML Family documents that embed rich semantic markup.
W3C XML Schema Definition Language (XSD) 1.1 Part 1: Structures
W3C XML Schema Definition Language (XSD) 1.1 Part 2: Datatypes
Internationalization Tag Set (ITS) Version 2.0
The technology described in this document “Internationalization Tag Set (ITS) 2.0“ enhances the foundation to integrate automated processing of human language into core Web technologies. ITS 2.0 bears many commonalities with its predecessor, ITS 1.0 but provides additional concepts that are designed to foster the automated creation and processing of multilingual Web content. ITS 2.0 focuses on HTML, XML-based formats in general, and can leverage processing based on the XML Localization Interchange File Format (XLIFF), as well as the Natural Language Processing Interchange Format (NIF).
Introducing the Extensible Markup Language (XML)
SGML and XML as Meta- Markup Languages
SGML and XML are formal metalanguage facilities for defining markup languages. SGML has the full power to configure a set of features for markup languages, whereas XML has a fixed set of these SGML features. Since XML is a profile of SGML (rather like a proper subset of SGML features), most introductory presentations about SGML convey relevant information about XML as well.