It seems there's no figures/diagrams in our docs. I vaguely recall that we used to have a few diagrams in our docs. If so, was there any technical reason to remove them?
I don't know the reason, but it's shame, we are still in sgml !
We already do our translations (as others) in xml using custom scripting. xml provides us better integration with available tools and ability to insert graphics. Last time we asked in -docs about moving to xml and Alexander demonstrated acceptable speed of xml build, but there were no reply from Peter, who is (?) responsible for our documentation infrastructure. Probably, we should just created a patch and submit to commitfest. You can check this thread http://www.postgresql.org/message-id/1428009501118.85114@postgrespro.ru