E.6.1 HyTime and architectures

<http://www.ornl.gov/sgml/wg4/docs/n1920/>

Online materials for the HyTime standard

<http://www.hytime.org/>

The HyTime users' group, including <http://www.hytime.org/papers/htguide.html>, The HyTime reader's guide

<http://www.oasis-open.org/cover/hytime.html>

The HyTime pages at Oasis.

<http://www.isogen.com/papers/archintro.html>

A very good tutorial introduction to SGML architectures

<http://www.cogsci.ed.ac.uk/%7eht/grove.html>

A picture of a grove.

<http://www.hytime.org/materials/sgmlpropset/index.html>

An online, hyperlinked, version of the SGML Property Set. This requires some understanding of the grove concept and the SGML property set, but once you have that, it's invaluable.