anchor.diff:  * `id`: the `User` ID corresponding to the member.
   * `role`: the role of the member inside the `Organization`. Only defiened when the event is `ADD_MEMBER`.
   
  -==== event = 'READ_VIEW'
  -
  -The `READ_VIEW` event for an `Organization` has a `data` attribute associated to a value that looks like this:
  -
  -TODO
  -
  -==== event = 'ADD_VIEW'
  -
  -The `ADD_VIEW` event for an `Organization` has a `data` attribute associated to a value that looks like this:
  +==== event = 'ADD_VIEW' OR event = 'READ_VIEW'
  +
  +The `ADD_VIEW` and `READ_VIEW` events for an `Organization` have a `data` attribute associated to a value that looks like this:
   
       {
           "organization" : "The organization identifier",
  
positive.code:         "type" : "Type fo the view"
      }
  
  *organization*
  
  The organization `tag` owning the view.
  	
  *name*
  
  
negative.code:         "rows" : "Category enumerating the rows"
      }
  
  * `columns`: a category `id` containing the values displayed in column titles. `Artifact` will be organized vertically according to the value of this category. This value is mandatory.
  * `rows`: a category `id` containing the values displayed in row titles. `Artifact` will be organized horizontally according to the value of this category. The value can be `undefined`, `null` or `false`. In this case the table has only one dimension.
  	
  Additional attributes when `type = 'timeseries'`.
  
  