1 files changed, 2 insertions, 8 deletions
diff --git a/lib/feature.rb b/lib/feature.rb
index f13a3fb..c6fb68a 100644
--- a/lib/feature.rb
+++ b/lib/feature.rb
@@ -6,7 +6,9 @@ module OpenTox
     field :numeric, type: Boolean
     field :measured, type: Boolean
     field :calculated, type: Boolean
+    field :category, type: String
     field :unit, type: String
+    field :conditions, type: Hash
   end
 
   # Feature for categorical variables
@@ -35,12 +37,4 @@ module OpenTox
     end
   end
 
-  # Feature for categorical bioassay results
-  class NominalBioAssay < NominalFeature
-  end
-
-  # Feature for quantitative bioassay results
-  class NumericBioAssay < NumericFeature
-  end
-
 end