kind of working,

still needs testing.
Added output return coercion in expression
Fixed formatting bugs

resources/Rosetta/test-period.rosetta

@@ -1,13 +1,21 @@
 namespace test.period : <"Something">
 version "${version.ok}"
 
-enum PeriodEnum: <"The enumerated values to specified the period, e.g. day, week.">
-    D displayName "day" <"Day">
-    M displayName "month" <"Month">
-    Y displayName "year" <"Year">
 
-type Period: <"description">
-    periodMultiplier int (1..1) <"A time period multiplier, e.g. 1, 2 or 3 etc. A negative value can be used when specifying an offset relative to another date, e.g. -2 days.">
-    testMany boolean (0..*) <"Test many">
-    testSome boolean (1..*) <"Test some">
-    testMaybeOne int (0..1) <"Test zero or one">
+type ExchangeRate:
+  from int (1..1)
+  to int (1..1)
+  
+
+type Obs:
+  constant number (0..1)
+  exchangeRate ExchangeRate (0..1)
+  condition: one-of
+
+func Konst:
+  inputs:
+    constant number (1..1)
+  output:
+    observable Obs (1..1)
+  assign-output observable -> constant:
+    constant