replace private visibility with protected #1512

Job	Run time
check-error-codes	7s
trigger-montiverse / trigger-montiverse	23s
test-for-breaking-changes	0s
build-generator	0s
test-it	-1s
build-mc	-1s
test-01-experiments	-1s
test-it-emf	-1s
test-02-experiments	-1s
test-grammar-it	-1s
test-montitrans	-1s
	23s

Provide feedback