New Types
- There is a new type referencethat models a reference to either graph content or a reference to a group- A reference to a group takes a resource, while a reference to graph content takes a resource for the group and auid
 
- A reference to a group takes a 
Breaking changes / Modified types:
- contenthas now been modified. the subtype- [%reference =uid]has now been changed to use the- [%reference reference]
- Graph store no longer accepts pokes with the mark %graph-update. Instead, it supports pokes with the mark%graph-update-1