https://monticore.github.io/monticore/monticore-grammar/javadoc/de/monticore/ocl/optionaloperators/_ast/ASTOptionalOperatorsNode.html
ASTOptionalOperatorsNode (monticore-grammar 7.9.0-SNAPSHOT API)
declaration: package: de.monticore.ocl.optionaloperators._ast, interface: ASTOptionalOperatorsNode
grammarsnapshotapi