anchor.diff:      keyword: String
       keywordMatchExact: Boolean
       last: Int
  +    locationCities: [String]
       majorPeriods: [String]
       marketable: Boolean
       medium: String
  
positive.code:     # When true, will only return exact keyword match
      keywordMatchExact: Boolean
      last: Int
      majorPeriods: [String]
  
      # When true, will only return `marketable` works (not nude or provocative).
  
negative.code:     # When true, will only return exact keyword match
      keywordMatchExact: Boolean
      last: Int
      locationCities: [String]
      majorPeriods: [String]
  
      # When true, will only return `marketable` works (not nude or provocative).
  