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 artist_name or id
                               dd Either the artist's 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.
                              dt username or id
                              dd Either the user's twitter name or their ID in this database must be supplied.
                      div.params.optional
  
negative.code:                         div.subtitle Mandatory parameters
                          dl
                              dt room
                              dd The ID of the room in Listening Room. This is a GUID.
                              dt artist_name and track_title or id
                              dd Either the track's title and the name of the artist must be supplied, or the ID of the track in this database.
                      div.params.optional
  