For a certain amount of time a had a a look on the Web Service Architecture from W3C. They used a concept map – a simple technique to represent terms and relations between them. Cause I’m always excited about convenient information representation I searched for a tool, supporting me to create concept maps. IHMC is offering a free CmapTools and even non-free/”cost model unknown” server infrastructure for collaborative editing and sharing of the concept maps. Pretty expressive is the list of publications