added multikey type

test/simple/mod.cg.yaml

@@ -1,7 +1,5 @@
-name: {
-  de: "Computergrafik",
-  en: "Computer Graphics"
-}
+name:
+  value: Computer Graphics
 
 id:
   value: CG
@@ -12,8 +10,14 @@ credits:
 form-of-exam: 
   value: written
 
-form:
-  value: lecture
+form-of-instruction:
+  value: { 'lecture': 2, 'exersise': 1 }
+
+term:
+  value: 1
+
+duration:
+  value: 1
 
 kind: 
   value: compulsory
@@ -88,3 +92,33 @@ media-of-instruction:
       * Goldstein, E. Bruce. Sensation and Perception. 3rd ed. Belmont, Calif.: Wadsworth Pub. Co., 1989
       * Hughes, John F. Computer Graphics: Principles and Practice. Third edition. Upper Saddle River, New Jersey: Addison-Wesley, 2014
       * Shirley, Peter, and R. Keith Morley. Realistic Ray Tracing. 2. ed. Natick, Mass: A K Peters, 2003
+
+prerequisites:
+  de: ""
+  en: ""
+
+author-of-indenture: 
+  de: ""
+  en: ""
+
+used-in:
+  de: "Master Applied Computerscience"
+  en: "Master Applied Computerscience"
+
+workload:
+  de: "2SWS Vorlesung 1SWS Übung"
+  en: "2SWS lecture 1SWS exersise"
+
+form-of-exam:
+  value: written
+
+frequency:
+  value: once_per_year
+
+
+kind:
+  value: compulsory
+
+remarks:
+  de: 
+  en: