use SConcept in SNodeOperations
remove unused interface IPropertyAccessQualifier
avoiding method collisions
change smodel generator
null-safety
generate SNodeOperations
manually fix generated code
generate generator
fix compilation error
use SContainmentLink in getChildren
use genuine link
add module dependency
generate generator
correct editor generator
add concept<>.asSConcept operation
fix compilation error
check that overriden concept behavior method has same isStatic modifier
correct incorrectly overriden behavior methods
rebuild
fix NPE if node is root