Extensible 3D (X3D)
- An extensible standard that can easily be supported by content creation tools, proprietary browsers, and other 3D applications, both for importing and exporting
- http://www.web3d.org/x3d/

XML Exchange Table DTD Module
- An XML DTD module based the full CALS table model described in OASIS Technical Memorandum TM 9502:1995. (OASIS Technical Memorandum TR 9901:1999)
- http://www.oasis-open.org/specs/tm9901.html

XML Resume Library
- XML DTD and XSL stylesheets for the interchange and web and print presentation of resumes and curricula vitae.
- http://xmlresume.sourceforge.net/

W3C Data Formats
- Brief technical note showing the relationships between the various World Wide Web Consortium controlled formats.
- http://www.w3.org/TR/NOTE-rdfarch

XML Software Autoupdate
- XSA is for automatically detecting new software releases.
- http://www.garshol.priv.no/download/xsa/dtddoc.html

W3C XML Specifications, Proposals and Vocabularies
- Master list of all XML-related specifications and proposals, developed by or submitted to the World Wide Web Consortium (W3C). This list also contains domain-specific XML vocabularies, some of which have not yet been submitted to the W3C for consideration
- http://wdvl.com/Authoring/Languages/XML/Specifications.html