gistfile1.txt

syntax Node = Key=Reference sm NodeContent;
syntax NodeContent = "{" outline_begin_before inl NodeMembers nl d outline_end "}";
syntax NodeMember
{
  | Attribute = Key=Reference sm ":" sm Value
  | Node = Node
}

syntax Value
{
  | StringLiteral
  | Number
  | Object = NodeContent;
  | Array  = "[" outline_begin_before Values outline_end "]";
}
  
// ----------------------

abstract ast NodeMember : BindableAst 
{
  Key : Reference;
}

ast Node : NodeMember
{
  NodeMembers : NodeMember*;
}

ast Attribute : NodeMember
{
  Val : Value;
}