While surfing the internet for more information on CMIS I found a lot of different meanings for CMIS. 
Here you find what I found out so far:

• Content Management Interoperability Services
   That’s what this blog is about!
• Common management information service
• Chiang Mai International School
• Mathematical and Information Sciences
• CSIRO Mathematical and Information Sciences
• Contractors & Manufacturers Insurance Services
• Center for Minimally Invasive Surgery
• Carrefour montréalais d’information sociosanitaire
• Computer Modeling and Intelligent Systems
• Central Management Information Systems
• Creative Management Information System
• any more … ?