Minor There are two issues with the way we are referencing ws calendar and emix within the EI doc. The first is that we are making wholesale references without any examples of how it is used to satisfy the requirements of EI so it is hard to evaluate wether their use is appropriate. The second is that presumably emix and ws calendar are standards that have their own scope and could be used for things other than EI. Therefore it is important to further specify how those standards are constrained and instantiated within EI. I made a comment related to this earlier related to references to ws calendar within EiEvent, I have the same concerns with emix.