1 files changed, 8 insertions, 0 deletions
diff --git a/lib/substance.rb b/lib/substance.rb
new file mode 100644
index 0000000..31c465e
--- /dev/null
+++ b/lib/substance.rb
@@ -0,0 +1,8 @@
+module OpenTox
+
+  class Substance
+    field :properties, type: Hash, default: {}
+    field :dataset_ids, type: Array, default: []
+  end
+
+end