Erjang-A-JVM-based-Erlang-VM by Kresten Krab Thorup
Presentation, slides and mp3 on Erjang. Kresten blogs about this project at: http://www.javalimit.com/.
Erlang and Erjang are not the basis for universal answers to all topic map needs.
However, robust message passing systems, such as Erlang and Erjang support, can figure into some topic map based solutions.
Just as there is no one method of subject identity that fits all purposes, there is no one topic map solution that fits all needs.
Discussions of solutions should always start with exploration and documentation of your requirements, not the capabilities of particular software, whether commercial, open source or home grown.
There will be time for you to learn about various software packages and why their capabilities matter more than your requirements later in the process.