Adapt Query DSL to Xtend Transformation
Improve the DSL to allow xtend expressions for Theta-joins and KeepCalculated-Expressions.
Furthermore the transformation-generator has to be adapted to complete the runtime-statements (https://svnserver.informatik.kit.edu/i43/svn/code/MDSD/ModelJoin/Core/trunk/edu.kit.ipd.sdq.mdsd.mj.transformation.xtend.generator/)
1) Change xtext dsl
2) Edit the theta-join and keep-calculated generators
The runtime doesn't need to be changed, the functions are already implemented.
Closed issue due to 'ModelJoin' project discontinuation.