anchor.diff:                          div.subtitle Mandatory parameters
                           dl
                               dt room
  -                            dd The name of the room to filter by.
  +                            dd The ID of the room in Listening Room. This is a GUID.
                               dt username or id
                               dd Either the user's twitter name or their ID in this database must be supplied.
                       div.params.optional
  
positive.code:                         div.subtitle Mandatory parameters
                          dl
                              dt room
                              dd The name of the room to filter by.
                      div.params.optional
                          div.subtitle Optional parameters
                          dl
  
negative.code:                         div.subtitle Mandatory parameters
                          dl
                              dt room
                              dd The ID of the room in Listening Room. This is a GUID.
                              dt username or id
                              dd Either the user's twitter name or their ID in this database must be supplied.
                      div.params.optional
  