View source for Hello World activity flow

*Creator defines semantic and activity
**Define entity and observation types
**Define actors to give access to those entity types
**Define activity
***Define observers to get things to apply actions on
***Define reasoners to apply actions on the things observed
***Associate actors to the activity
**Publish activity, sharing it with follower tenants
*Follower subscribes to the service
**Follower will adquire all the actors associated to the activity
*Follower invite other followers. It can select the actor to give to the invited user