[Updated versions of the Tag Set have been released. The current version is available here.]
Version 2.3 was released on March 28, 2007.
The files for Version 2.3 are available:
The Tag Library for version 2.3 is here: https://dtd.nlm.nih.gov/book/tag-library/2.3/
The full list of updates in version 2.3 is available in the Change Report.
A Frequently Asked Questions page is available.
In addition to the DTD format, the Tag Set is also available as a W3C XML schema and as a RELAX NG schema. Both are generated directly from the DTD and neither is intended for maintenance. See the individual schema pages for more information.
Last updated: November 21, 2008