inlineShapeNot: negation? inlineShapeAtom

def visitInlineShapeNot(self, ctx: ShExDocParser.InlineShapeNotContext):
        """ inlineShapeNot: negation? inlineShapeAtom """
        if ctx.negation():
            self.expr = ShapeNot(id=self.label)
            sn = ShexShapeExpressionParser(self.context)
            ctx.inlineShapeAtom()
            sn.visit(ctx.inlineShapeAtom())
            self.expr.shapeExpr = sn.expr if sn.expr is not None else Shape()
        else:
            self.visitChildren(ctx)