Almost working entity.xtext file

NOTE THAT IT IS NOT A MISTAKE WHEN IT GIVES THE ERROR IN THE TESTFILE:
"COULD NOT RESOLVE REFERENCE TO ATTRIBUTE TITLE". 
THIS PROBLEM CAN ONLY BE FIXED USING SCOPING. LOOK AT THIS DISCUSSION
THREAD FROM our LECTURE:
https://tuwel.tuwien.ac.at/mod/forum/discuss.php?d=53736

Only thing left is the Enums