https://monticore.github.io/monticore/monticore-grammar/javadoc/de/monticore/grammar/cocos/ProdExtendsNotExistingProd.html
ProdExtendsNotExistingProd (monticore-grammar 7.9.0-SNAPSHOT API)
declaration: package: de.monticore.grammar.cocos, class: ProdExtendsNotExistingProd
grammarsnapshotapi