+|trash_at|datetime|If @trash_at@ is non-null and in the past, this collection will be hidden from API calls. May be untrashed.||
+|delete_at|datetime|If @delete_at@ is non-null and in the past, the collection may be permanently deleted.||
+|is_trashed|datetime|True if @trash_at@ is in the past, false if not.||
+
+h3. Conditions of creating a Collection
+
+The @portable_data_hash@ and @manifest_text@ attributes must be provided when creating a Collection. The cryptographic digest of the supplied @manifest_text@ must match the supplied @portable_data_hash@.
+
+h3. Side effects of creating a Collection
+
+Referenced blocks are protected from garbage collection in Keep.
+
+Data can be shared with other users via the Arvados permission model.