docs: def visitStartActions(self, ctx: ShExDocParser.StartActionsContext):
          """ startActions: codeDecl+ """
          self.context.schema.startActs = []
          for cd in ctx.codeDecl():
              cdparser = ShexAnnotationAndSemactsParser(self.context)
              cdparser.visit(cd)
              self.context.schema.startActs += cdparser.semacts