anchor.diff:      + id: 1 (required, string) - ID of the source; TODO shouldn't we use URIs?
       
   + Attributes (object)
  -    + id: 1 (string) - The id of the statement
  -    + uri: http://www.agerpres.ro/politica/2016/07/10/dragnea-de-cand-e-gabriela-firea-primar-nu-s-a-taiat-niciun-pom-pe-kiseleff-21-41-07 (string)
  +    + data (Source Object)
   
   ### View a source [GET]
   
  
positive.code: ### List all sources [GET]
  
  + Response 200 (application/json)
      + Attributes (array[Source])
  
negative.code:     + id: 1 (required, string) - ID of the statement
      
  + Attributes (object)
      + data (Statement Object)
      
  ### View specific statement [GET]
  
  + Response 200 (application/json)
  